From f848e7703956a6c37871432a7e128f51b1700aa0 Mon Sep 17 00:00:00 2001
From: Trevor Buckner <calculuschild@gmail.com>
Date: Sun, 7 Feb 2021 17:22:47 -0500
Subject: [PATCH 1/4] fix: Join adjacent inlineText tokens (#1926)

---
 docs/USING_PRO.md       |  4 +--
 lib/marked.esm.js       | 68 +++++++++++++++++++-------------------
 lib/marked.js           | 72 ++++++++++++++++++++++-------------------
 src/Lexer.js            | 47 +++++++++++++++++++--------
 src/Tokenizer.js        | 21 ++----------
 test/unit/Lexer-spec.js |  7 ++--
 6 files changed, 112 insertions(+), 107 deletions(-)

diff --git a/docs/USING_PRO.md b/docs/USING_PRO.md
index b8fc872c6b..770a2ca18f 100644
--- a/docs/USING_PRO.md
+++ b/docs/USING_PRO.md
@@ -157,7 +157,7 @@ console.log(marked('$ latex code $\n\n` other code `'));
 ### Block level tokenizer methods
 
 - space(*string* src)
-- code(*string* src, *array* tokens)
+- code(*string* src)
 - fences(*string* src)
 - heading(*string* src)
 - nptable(*string* src)
@@ -169,7 +169,7 @@ console.log(marked('$ latex code $\n\n` other code `'));
 - table(*string* src)
 - lheading(*string* src)
 - paragraph(*string* src)
-- text(*string* src, *array* tokens)
+- text(*string* src)
 
 ### Inline level tokenizer methods
 
diff --git a/lib/marked.esm.js b/lib/marked.esm.js
index 3b294451db..31ed6e80be 100644
--- a/lib/marked.esm.js
+++ b/lib/marked.esm.js
@@ -391,18 +391,9 @@ var Tokenizer_1 = class Tokenizer {
     }
   }
 
-  code(src, tokens) {
+  code(src) {
     const cap = this.rules.block.code.exec(src);
     if (cap) {
-      const lastToken = tokens[tokens.length - 1];
-      // An indented code block cannot interrupt a paragraph.
-      if (lastToken && lastToken.type === 'paragraph') {
-        return {
-          raw: cap[0],
-          text: cap[0].trimRight()
-        };
-      }
-
       const text = cap[0].replace(/^ {1,4}/gm, '');
       return {
         type: 'code',
@@ -722,17 +713,9 @@ var Tokenizer_1 = class Tokenizer {
     }
   }
 
-  text(src, tokens) {
+  text(src) {
     const cap = this.rules.block.text.exec(src);
     if (cap) {
-      const lastToken = tokens[tokens.length - 1];
-      if (lastToken && lastToken.type === 'text') {
-        return {
-          raw: cap[0],
-          text: cap[0]
-        };
-      }
-
       return {
         type: 'text',
         raw: cap[0],
@@ -1505,14 +1488,15 @@ var Lexer_1 = class Lexer {
       }
 
       // code
-      if (token = this.tokenizer.code(src, tokens)) {
+      if (token = this.tokenizer.code(src)) {
         src = src.substring(token.raw.length);
-        if (token.type) {
-          tokens.push(token);
-        } else {
-          lastToken = tokens[tokens.length - 1];
+        lastToken = tokens[tokens.length - 1];
+        // An indented code block cannot interrupt a paragraph.
+        if (lastToken && lastToken.type === 'paragraph') {
           lastToken.raw += '\n' + token.raw;
           lastToken.text += '\n' + token.text;
+        } else {
+          tokens.push(token);
         }
         continue;
       }
@@ -1605,14 +1589,14 @@ var Lexer_1 = class Lexer {
       }
 
       // text
-      if (token = this.tokenizer.text(src, tokens)) {
+      if (token = this.tokenizer.text(src)) {
         src = src.substring(token.raw.length);
-        if (token.type) {
-          tokens.push(token);
-        } else {
-          lastToken = tokens[tokens.length - 1];
+        lastToken = tokens[tokens.length - 1];
+        if (lastToken && lastToken.type === 'text') {
           lastToken.raw += '\n' + token.raw;
           lastToken.text += '\n' + token.text;
+        } else {
+          tokens.push(token);
         }
         continue;
       }
@@ -1697,7 +1681,7 @@ var Lexer_1 = class Lexer {
    * Lexing/Compiling
    */
   inlineTokens(src, tokens = [], inLink = false, inRawBlock = false) {
-    let token;
+    let token, lastToken;
 
     // String with links masked to avoid interference with em and strong
     let maskedSrc = src;
@@ -1737,7 +1721,13 @@ var Lexer_1 = class Lexer {
         src = src.substring(token.raw.length);
         inLink = token.inLink;
         inRawBlock = token.inRawBlock;
-        tokens.push(token);
+        lastToken = tokens[tokens.length - 1];
+        if (lastToken && token.type === 'text' && lastToken.type === 'text') {
+          lastToken.raw += token.raw;
+          lastToken.text += token.text;
+        } else {
+          tokens.push(token);
+        }
         continue;
       }
 
@@ -1754,10 +1744,16 @@ var Lexer_1 = class Lexer {
       // reflink, nolink
       if (token = this.tokenizer.reflink(src, this.tokens.links)) {
         src = src.substring(token.raw.length);
+        lastToken = tokens[tokens.length - 1];
         if (token.type === 'link') {
           token.tokens = this.inlineTokens(token.text, [], true, inRawBlock);
+          tokens.push(token);
+        } else if (lastToken && token.type === 'text' && lastToken.type === 'text') {
+          lastToken.raw += token.raw;
+          lastToken.text += token.text;
+        } else {
+          tokens.push(token);
         }
-        tokens.push(token);
         continue;
       }
 
@@ -1818,7 +1814,13 @@ var Lexer_1 = class Lexer {
         src = src.substring(token.raw.length);
         prevChar = token.raw.slice(-1);
         keepPrevChar = true;
-        tokens.push(token);
+        lastToken = tokens[tokens.length - 1];
+        if (lastToken && lastToken.type === 'text') {
+          lastToken.raw += token.raw;
+          lastToken.text += token.text;
+        } else {
+          tokens.push(token);
+        }
         continue;
       }
 
diff --git a/lib/marked.js b/lib/marked.js
index 5b4e2d78d4..904a9f1077 100644
--- a/lib/marked.js
+++ b/lib/marked.js
@@ -488,19 +488,10 @@
       }
     };
 
-    _proto.code = function code(src, tokens) {
+    _proto.code = function code(src) {
       var cap = this.rules.block.code.exec(src);
 
       if (cap) {
-        var lastToken = tokens[tokens.length - 1]; // An indented code block cannot interrupt a paragraph.
-
-        if (lastToken && lastToken.type === 'paragraph') {
-          return {
-            raw: cap[0],
-            text: cap[0].trimRight()
-          };
-        }
-
         var text = cap[0].replace(/^ {1,4}/gm, '');
         return {
           type: 'code',
@@ -812,19 +803,10 @@
       }
     };
 
-    _proto.text = function text(src, tokens) {
+    _proto.text = function text(src) {
       var cap = this.rules.block.text.exec(src);
 
       if (cap) {
-        var lastToken = tokens[tokens.length - 1];
-
-        if (lastToken && lastToken.type === 'text') {
-          return {
-            raw: cap[0],
-            text: cap[0]
-          };
-        }
-
         return {
           type: 'text',
           raw: cap[0],
@@ -1497,15 +1479,15 @@
         } // code
 
 
-        if (token = this.tokenizer.code(src, tokens)) {
+        if (token = this.tokenizer.code(src)) {
           src = src.substring(token.raw.length);
+          lastToken = tokens[tokens.length - 1]; // An indented code block cannot interrupt a paragraph.
 
-          if (token.type) {
-            tokens.push(token);
-          } else {
-            lastToken = tokens[tokens.length - 1];
+          if (lastToken && lastToken.type === 'paragraph') {
             lastToken.raw += '\n' + token.raw;
             lastToken.text += '\n' + token.text;
+          } else {
+            tokens.push(token);
           }
 
           continue;
@@ -1603,15 +1585,15 @@
         } // text
 
 
-        if (token = this.tokenizer.text(src, tokens)) {
+        if (token = this.tokenizer.text(src)) {
           src = src.substring(token.raw.length);
+          lastToken = tokens[tokens.length - 1];
 
-          if (token.type) {
-            tokens.push(token);
-          } else {
-            lastToken = tokens[tokens.length - 1];
+          if (lastToken && lastToken.type === 'text') {
             lastToken.raw += '\n' + token.raw;
             lastToken.text += '\n' + token.text;
+          } else {
+            tokens.push(token);
           }
 
           continue;
@@ -1718,7 +1700,7 @@
         inRawBlock = false;
       }
 
-      var token; // String with links masked to avoid interference with em and strong
+      var token, lastToken; // String with links masked to avoid interference with em and strong
 
       var maskedSrc = src;
       var match;
@@ -1759,7 +1741,15 @@
           src = src.substring(token.raw.length);
           inLink = token.inLink;
           inRawBlock = token.inRawBlock;
-          tokens.push(token);
+          var _lastToken = tokens[tokens.length - 1];
+
+          if (_lastToken && token.type === 'text' && _lastToken.type === 'text') {
+            _lastToken.raw += token.raw;
+            _lastToken.text += token.text;
+          } else {
+            tokens.push(token);
+          }
+
           continue;
         } // link
 
@@ -1778,12 +1768,18 @@
 
         if (token = this.tokenizer.reflink(src, this.tokens.links)) {
           src = src.substring(token.raw.length);
+          var _lastToken2 = tokens[tokens.length - 1];
 
           if (token.type === 'link') {
             token.tokens = this.inlineTokens(token.text, [], true, inRawBlock);
+            tokens.push(token);
+          } else if (_lastToken2 && token.type === 'text' && _lastToken2.type === 'text') {
+            _lastToken2.raw += token.raw;
+            _lastToken2.text += token.text;
+          } else {
+            tokens.push(token);
           }
 
-          tokens.push(token);
           continue;
         } // strong
 
@@ -1844,7 +1840,15 @@
           src = src.substring(token.raw.length);
           prevChar = token.raw.slice(-1);
           keepPrevChar = true;
-          tokens.push(token);
+          lastToken = tokens[tokens.length - 1];
+
+          if (lastToken && lastToken.type === 'text') {
+            lastToken.raw += token.raw;
+            lastToken.text += token.text;
+          } else {
+            tokens.push(token);
+          }
+
           continue;
         }
 
diff --git a/src/Lexer.js b/src/Lexer.js
index bb04b43101..111cc96304 100644
--- a/src/Lexer.js
+++ b/src/Lexer.js
@@ -136,14 +136,15 @@ module.exports = class Lexer {
       }
 
       // code
-      if (token = this.tokenizer.code(src, tokens)) {
+      if (token = this.tokenizer.code(src)) {
         src = src.substring(token.raw.length);
-        if (token.type) {
-          tokens.push(token);
-        } else {
-          lastToken = tokens[tokens.length - 1];
+        lastToken = tokens[tokens.length - 1];
+        // An indented code block cannot interrupt a paragraph.
+        if (lastToken && lastToken.type === 'paragraph') {
           lastToken.raw += '\n' + token.raw;
           lastToken.text += '\n' + token.text;
+        } else {
+          tokens.push(token);
         }
         continue;
       }
@@ -236,14 +237,14 @@ module.exports = class Lexer {
       }
 
       // text
-      if (token = this.tokenizer.text(src, tokens)) {
+      if (token = this.tokenizer.text(src)) {
         src = src.substring(token.raw.length);
-        if (token.type) {
-          tokens.push(token);
-        } else {
-          lastToken = tokens[tokens.length - 1];
+        lastToken = tokens[tokens.length - 1];
+        if (lastToken && lastToken.type === 'text') {
           lastToken.raw += '\n' + token.raw;
           lastToken.text += '\n' + token.text;
+        } else {
+          tokens.push(token);
         }
         continue;
       }
@@ -331,7 +332,7 @@ module.exports = class Lexer {
    * Lexing/Compiling
    */
   inlineTokens(src, tokens = [], inLink = false, inRawBlock = false) {
-    let token;
+    let token, lastToken;
 
     // String with links masked to avoid interference with em and strong
     let maskedSrc = src;
@@ -371,7 +372,13 @@ module.exports = class Lexer {
         src = src.substring(token.raw.length);
         inLink = token.inLink;
         inRawBlock = token.inRawBlock;
-        tokens.push(token);
+        const lastToken = tokens[tokens.length - 1];
+        if (lastToken && token.type === 'text' && lastToken.type === 'text') {
+          lastToken.raw += token.raw;
+          lastToken.text += token.text;
+        } else {
+          tokens.push(token);
+        }
         continue;
       }
 
@@ -388,10 +395,16 @@ module.exports = class Lexer {
       // reflink, nolink
       if (token = this.tokenizer.reflink(src, this.tokens.links)) {
         src = src.substring(token.raw.length);
+        const lastToken = tokens[tokens.length - 1];
         if (token.type === 'link') {
           token.tokens = this.inlineTokens(token.text, [], true, inRawBlock);
+          tokens.push(token);
+        } else if (lastToken && token.type === 'text' && lastToken.type === 'text') {
+          lastToken.raw += token.raw;
+          lastToken.text += token.text;
+        } else {
+          tokens.push(token);
         }
-        tokens.push(token);
         continue;
       }
 
@@ -452,7 +465,13 @@ module.exports = class Lexer {
         src = src.substring(token.raw.length);
         prevChar = token.raw.slice(-1);
         keepPrevChar = true;
-        tokens.push(token);
+        lastToken = tokens[tokens.length - 1];
+        if (lastToken && lastToken.type === 'text') {
+          lastToken.raw += token.raw;
+          lastToken.text += token.text;
+        } else {
+          tokens.push(token);
+        }
         continue;
       }
 
diff --git a/src/Tokenizer.js b/src/Tokenizer.js
index 056cc3ff40..4b1eebf96d 100644
--- a/src/Tokenizer.js
+++ b/src/Tokenizer.js
@@ -79,18 +79,9 @@ module.exports = class Tokenizer {
     }
   }
 
-  code(src, tokens) {
+  code(src) {
     const cap = this.rules.block.code.exec(src);
     if (cap) {
-      const lastToken = tokens[tokens.length - 1];
-      // An indented code block cannot interrupt a paragraph.
-      if (lastToken && lastToken.type === 'paragraph') {
-        return {
-          raw: cap[0],
-          text: cap[0].trimRight()
-        };
-      }
-
       const text = cap[0].replace(/^ {1,4}/gm, '');
       return {
         type: 'code',
@@ -410,17 +401,9 @@ module.exports = class Tokenizer {
     }
   }
 
-  text(src, tokens) {
+  text(src) {
     const cap = this.rules.block.text.exec(src);
     if (cap) {
-      const lastToken = tokens[tokens.length - 1];
-      if (lastToken && lastToken.type === 'text') {
-        return {
-          raw: cap[0],
-          text: cap[0]
-        };
-      }
-
       return {
         type: 'text',
         raw: cap[0],
diff --git a/test/unit/Lexer-spec.js b/test/unit/Lexer-spec.js
index 192c8cc5fd..3a507f010a 100644
--- a/test/unit/Lexer-spec.js
+++ b/test/unit/Lexer-spec.js
@@ -616,9 +616,7 @@ a | b
           md: '<div>html</div>',
           options: { sanitize: true },
           tokens: [
-            { type: 'text', raw: '<div>', inLink: false, inRawBlock: false, text: '&lt;div&gt;' },
-            { type: 'text', raw: 'html', text: 'html' },
-            { type: 'text', raw: '</div>', inLink: false, inRawBlock: false, text: '&lt;/div&gt;' }
+            { type: 'text', raw: '<div>html</div>', inLink: false, inRawBlock: false, text: '&lt;div&gt;html&lt;/div&gt;' }
           ]
         });
       });
@@ -740,8 +738,7 @@ a | b
           expectInlineTokens({
             md: '[link]',
             tokens: [
-              { type: 'text', raw: '[', text: '[' },
-              { type: 'text', raw: 'link]', text: 'link]' }
+              { type: 'text', raw: '[link]', text: '[link]' }
             ]
           });
         });

From 7293251c438e3ee968970f7609f1a27f9007bccd Mon Sep 17 00:00:00 2001
From: Trevor Buckner <calculuschild@gmail.com>
Date: Sun, 7 Feb 2021 17:25:01 -0500
Subject: [PATCH 2/4] fix: Total rework of Emphasis/Strong (#1864)

BREAKING CHANGE: `em` and `strong` tokenizers have been merged into one `emStrong` tokenizer
---
 lib/marked.esm.js                             | 164 ++++++++----------
 lib/marked.js                                 | 153 ++++++++--------
 marked.min.js                                 |   2 +-
 src/Lexer.js                                  |  22 +--
 src/Tokenizer.js                              |  71 +++++---
 src/rules.js                                  |  71 ++------
 test/specs/bug/adjacent_lists.html            |   1 +
 test/specs/bug/adjacent_lists.md              |   1 +
 test/specs/commonmark/commonmark.0.29.json    |  66 +++----
 test/specs/gfm/commonmark.0.29.json           |  66 +++----
 test/specs/new/em_list_links.html             |  17 +-
 .../original/strong_and_em_together.html      |   7 -
 test/specs/original/strong_and_em_together.md |   7 -
 test/specs/redos/quadratic_underscores.js     |   4 +
 14 files changed, 280 insertions(+), 372 deletions(-)
 create mode 100644 test/specs/bug/adjacent_lists.html
 create mode 100644 test/specs/bug/adjacent_lists.md
 delete mode 100644 test/specs/original/strong_and_em_together.html
 delete mode 100644 test/specs/original/strong_and_em_together.md
 create mode 100644 test/specs/redos/quadratic_underscores.js

diff --git a/lib/marked.esm.js b/lib/marked.esm.js
index 31ed6e80be..d40c19a59d 100644
--- a/lib/marked.esm.js
+++ b/lib/marked.esm.js
@@ -839,46 +839,61 @@ var Tokenizer_1 = class Tokenizer {
     }
   }
 
-  strong(src, maskedSrc, prevChar = '') {
-    let match = this.rules.inline.strong.start.exec(src);
+  emStrong(src, maskedSrc, prevChar = '') {
+    let match = this.rules.inline.emStrong.lDelim.exec(src);
+    if (!match) return;
 
-    if (match && (!match[1] || (match[1] && (prevChar === '' || this.rules.inline.punctuation.exec(prevChar))))) {
-      maskedSrc = maskedSrc.slice(-1 * src.length);
-      const endReg = match[0] === '**' ? this.rules.inline.strong.endAst : this.rules.inline.strong.endUnd;
+    if (match[3] && prevChar.match(/[\p{L}\p{N}]/u)) return; // _ can't be between two alphanumerics. \p{L}\p{N} includes non-english alphabet/numbers as well
 
+    const nextChar = match[1] || match[2] || '';
+
+    if (!nextChar || (nextChar && (prevChar === '' || this.rules.inline.punctuation.exec(prevChar)))) {
+      const lLength = match[0].length - 1;
+      let rDelim, rLength, delimTotal = lLength, midDelimTotal = 0;
+
+      const endReg = match[0][0] === '*' ? this.rules.inline.emStrong.rDelimAst : this.rules.inline.emStrong.rDelimUnd;
       endReg.lastIndex = 0;
 
-      let cap;
+      maskedSrc = maskedSrc.slice(-1 * src.length + lLength); // Bump maskedSrc to same section of string as src (move to lexer?)
+
       while ((match = endReg.exec(maskedSrc)) != null) {
-        cap = this.rules.inline.strong.middle.exec(maskedSrc.slice(0, match.index + 3));
-        if (cap) {
-          return {
-            type: 'strong',
-            raw: src.slice(0, cap[0].length),
-            text: src.slice(2, cap[0].length - 2)
-          };
+        rDelim = match[1] || match[2] || match[3] || match[4] || match[5] || match[6];
+
+        if (!rDelim) continue; // matched the first alternative in rules.js (skip the * in __abc*abc__)
+
+        rLength = rDelim.length;
+
+        if (match[3] || match[4]) { // found another Left Delim
+          delimTotal += rLength;
+          continue;
+        } else if (match[5] || match[6]) { // either Left or Right Delim
+          if (lLength % 3 && !((lLength + rLength) % 3)) {
+            midDelimTotal += rLength;
+            continue; // CommonMark Emphasis Rules 9-10
+          }
         }
-      }
-    }
-  }
 
-  em(src, maskedSrc, prevChar = '') {
-    let match = this.rules.inline.em.start.exec(src);
+        delimTotal -= rLength;
 
-    if (match && (!match[1] || (match[1] && (prevChar === '' || this.rules.inline.punctuation.exec(prevChar))))) {
-      maskedSrc = maskedSrc.slice(-1 * src.length);
-      const endReg = match[0] === '*' ? this.rules.inline.em.endAst : this.rules.inline.em.endUnd;
+        if (delimTotal > 0) continue; // Haven't found enough closing delimiters
 
-      endReg.lastIndex = 0;
+        // If this is the last rDelimiter, remove extra characters. *a*** -> *a*
+        if (delimTotal + midDelimTotal - rLength <= 0 && !maskedSrc.slice(endReg.lastIndex).match(endReg)) {
+          rLength = Math.min(rLength, rLength + delimTotal + midDelimTotal);
+        }
 
-      let cap;
-      while ((match = endReg.exec(maskedSrc)) != null) {
-        cap = this.rules.inline.em.middle.exec(maskedSrc.slice(0, match.index + 2));
-        if (cap) {
+        if (Math.min(lLength, rLength) % 2) {
           return {
             type: 'em',
-            raw: src.slice(0, cap[0].length),
-            text: src.slice(1, cap[0].length - 1)
+            raw: src.slice(0, lLength + match.index + rLength + 1),
+            text: src.slice(1, lLength + match.index + rLength)
+          };
+        }
+        if (Math.min(lLength, rLength) % 2 === 0) {
+          return {
+            type: 'strong',
+            raw: src.slice(0, lLength + match.index + rLength + 1),
+            text: src.slice(2, lLength + match.index + rLength - 1)
           };
         }
       }
@@ -1182,74 +1197,41 @@ const inline = {
   reflink: /^!?\[(label)\]\[(?!\s*\])((?:\\[\[\]]?|[^\[\]\\])+)\]/,
   nolink: /^!?\[(?!\s*\])((?:\[[^\[\]]*\]|\\[\[\]]|[^\[\]])*)\](?:\[\])?/,
   reflinkSearch: 'reflink|nolink(?!\\()',
-  strong: {
-    start: /^(?:(\*\*(?=[*punctuation]))|\*\*)(?![\s])|__/, // (1) returns if starts w/ punctuation
-    middle: /^\*\*(?:(?:(?!overlapSkip)(?:[^*]|\\\*)|overlapSkip)|\*(?:(?!overlapSkip)(?:[^*]|\\\*)|overlapSkip)*?\*)+?\*\*$|^__(?![\s])((?:(?:(?!overlapSkip)(?:[^_]|\\_)|overlapSkip)|_(?:(?!overlapSkip)(?:[^_]|\\_)|overlapSkip)*?_)+?)__$/,
-    endAst: /[^punctuation\s]\*\*(?!\*)|[punctuation]\*\*(?!\*)(?:(?=[punctuation_\s]|$))/, // last char can't be punct, or final * must also be followed by punct (or endline)
-    endUnd: /[^\s]__(?!_)(?:(?=[punctuation*\s])|$)/ // last char can't be a space, and final _ must preceed punct or \s (or endline)
-  },
-  em: {
-    start: /^(?:(\*(?=[punctuation]))|\*)(?![*\s])|_/, // (1) returns if starts w/ punctuation
-    middle: /^\*(?:(?:(?!overlapSkip)(?:[^*]|\\\*)|overlapSkip)|\*(?:(?!overlapSkip)(?:[^*]|\\\*)|overlapSkip)*?\*)+?\*$|^_(?![_\s])(?:(?:(?!overlapSkip)(?:[^_]|\\_)|overlapSkip)|_(?:(?!overlapSkip)(?:[^_]|\\_)|overlapSkip)*?_)+?_$/,
-    endAst: /[^punctuation\s]\*(?!\*)|[punctuation]\*(?!\*)(?:(?=[punctuation_\s]|$))/, // last char can't be punct, or final * must also be followed by punct (or endline)
-    endUnd: /[^\s]_(?!_)(?:(?=[punctuation*\s])|$)/ // last char can't be a space, and final _ must preceed punct or \s (or endline)
+  emStrong: {
+    lDelim: /^(?:\*+(?:([punct_])|[^\s*]))|^_+(?:([punct*])|([^\s_]))/,
+    //        (1) and (2) can only be a Right Delimiter. (3) and (4) can only be Left.  (5) and (6) can be either Left or Right.
+    //        () Skip other delimiter (1) #***                (2) a***#, a***                   (3) #***a, ***a                 (4) ***#              (5) #***#                 (6) a***a
+    rDelimAst: /\_\_[^_]*?\*[^_]*?\_\_|[punct_](\*+)(?=[\s]|$)|[^punct*_\s](\*+)(?=[punct_\s]|$)|[punct_\s](\*+)(?=[^punct*_\s])|[\s](\*+)(?=[punct_])|[punct_](\*+)(?=[punct_])|[^punct*_\s](\*+)(?=[^punct*_\s])/,
+    rDelimUnd: /\*\*[^*]*?\_[^*]*?\*\*|[punct*](\_+)(?=[\s]|$)|[^punct*_\s](\_+)(?=[punct*\s]|$)|[punct*\s](\_+)(?=[^punct*_\s])|[\s](\_+)(?=[punct*])|[punct*](\_+)(?=[punct*])/ // ^- Not allowed for _
   },
   code: /^(`+)([^`]|[^`][\s\S]*?[^`])\1(?!`)/,
   br: /^( {2,}|\\)\n(?!\s*$)/,
   del: noopTest$1,
-  text: /^(`+|[^`])(?:(?= {2,}\n)|[\s\S]*?(?:(?=[\\<!\[`*]|\b_|$)|[^ ](?= {2,}\n)))/,
-  punctuation: /^([\s*punctuation])/
+  text: /^(`+|[^`])(?:(?= {2,}\n)|[\s\S]*?(?:(?=[\\<!\[`*_]|\b_|$)|[^ ](?= {2,}\n)))/,
+  punctuation: /^([\spunctuation])/
 };
 
-// list of punctuation marks from common mark spec
-// without * and _ to workaround cases with double emphasis
+// list of punctuation marks from CommonMark spec
+// without * and _ to handle the different emphasis markers * and _
 inline._punctuation = '!"#$%&\'()+\\-.,/:;<=>?@\\[\\]`^{|}~';
 inline.punctuation = edit$1(inline.punctuation).replace(/punctuation/g, inline._punctuation).getRegex();
 
 // sequences em should skip over [title](link), `code`, <html>
-inline._blockSkip = '\\[[^\\]]*?\\]\\([^\\)]*?\\)|`[^`]*?`|<[^>]*?>';
-inline._overlapSkip = '__[^_]*?__|\\*\\*\\[^\\*\\]*?\\*\\*';
+inline.blockSkip = /\[[^\]]*?\]\([^\)]*?\)|`[^`]*?`|<[^>]*?>/g;
+inline.escapedEmSt = /\\\*|\\_/g;
 
 inline._comment = edit$1(block._comment).replace('(?:-->|$)', '-->').getRegex();
 
-inline.em.start = edit$1(inline.em.start)
-  .replace(/punctuation/g, inline._punctuation)
+inline.emStrong.lDelim = edit$1(inline.emStrong.lDelim)
+  .replace(/punct/g, inline._punctuation)
   .getRegex();
 
-inline.em.middle = edit$1(inline.em.middle)
-  .replace(/punctuation/g, inline._punctuation)
-  .replace(/overlapSkip/g, inline._overlapSkip)
+inline.emStrong.rDelimAst = edit$1(inline.emStrong.rDelimAst, 'g')
+  .replace(/punct/g, inline._punctuation)
   .getRegex();
 
-inline.em.endAst = edit$1(inline.em.endAst, 'g')
-  .replace(/punctuation/g, inline._punctuation)
-  .getRegex();
-
-inline.em.endUnd = edit$1(inline.em.endUnd, 'g')
-  .replace(/punctuation/g, inline._punctuation)
-  .getRegex();
-
-inline.strong.start = edit$1(inline.strong.start)
-  .replace(/punctuation/g, inline._punctuation)
-  .getRegex();
-
-inline.strong.middle = edit$1(inline.strong.middle)
-  .replace(/punctuation/g, inline._punctuation)
-  .replace(/overlapSkip/g, inline._overlapSkip)
-  .getRegex();
-
-inline.strong.endAst = edit$1(inline.strong.endAst, 'g')
-  .replace(/punctuation/g, inline._punctuation)
-  .getRegex();
-
-inline.strong.endUnd = edit$1(inline.strong.endUnd, 'g')
-  .replace(/punctuation/g, inline._punctuation)
-  .getRegex();
-
-inline.blockSkip = edit$1(inline._blockSkip, 'g')
-  .getRegex();
-
-inline.overlapSkip = edit$1(inline._overlapSkip, 'g')
+inline.emStrong.rDelimUnd = edit$1(inline.emStrong.rDelimUnd, 'g')
+  .replace(/punct/g, inline._punctuation)
   .getRegex();
 
 inline._escapes = /\\([!"#$%&'()*+,\-./:;<=>?@\[\]\\^_`{|}~])/g;
@@ -1328,7 +1310,7 @@ inline.gfm = merge$1({}, inline.normal, {
   url: /^((?:ftp|https?):\/\/|www\.)(?:[a-zA-Z0-9\-]+\.?)+[^\s<]*|^email/,
   _backpedal: /(?:[^?!.,:;*_~()&]+|\([^)]*\)|&(?![a-zA-Z0-9]+;$)|[?!.,:;*_~)]+(?!$))+/,
   del: /^(~~?)(?=[^\s~])([\s\S]*?[^\s~])\1(?=[^~]|$)/,
-  text: /^([`~]+|[^`~])(?:(?= {2,}\n)|[\s\S]*?(?:(?=[\\<!\[`*~]|\b_|https?:\/\/|ftp:\/\/|www\.|$)|[^ ](?= {2,}\n)|[^a-zA-Z0-9.!#$%&'*+\/=?_`{\|}~-](?=[a-zA-Z0-9.!#$%&'*+\/=?_`{\|}~-]+@))|(?=[a-zA-Z0-9.!#$%&'*+\/=?_`{\|}~-]+@))/
+  text: /^([`~]+|[^`~])(?:(?= {2,}\n)|[\s\S]*?(?:(?=[\\<!\[`*~_]|\b_|https?:\/\/|ftp:\/\/|www\.|$)|[^ ](?= {2,}\n)|[^a-zA-Z0-9.!#$%&'*+\/=?_`{\|}~-](?=[a-zA-Z0-9.!#$%&'*+\/=?_`{\|}~-]+@))|(?=[a-zA-Z0-9.!#$%&'*+\/=?_`{\|}~-]+@))/
 });
 
 inline.gfm.url = edit$1(inline.gfm.url, 'i')
@@ -1704,11 +1686,17 @@ var Lexer_1 = class Lexer {
       maskedSrc = maskedSrc.slice(0, match.index) + '[' + repeatString$1('a', match[0].length - 2) + ']' + maskedSrc.slice(this.tokenizer.rules.inline.blockSkip.lastIndex);
     }
 
+    // Mask out escaped em & strong delimiters
+    while ((match = this.tokenizer.rules.inline.escapedEmSt.exec(maskedSrc)) != null) {
+      maskedSrc = maskedSrc.slice(0, match.index) + '++' + maskedSrc.slice(this.tokenizer.rules.inline.escapedEmSt.lastIndex);
+    }
+
     while (src) {
       if (!keepPrevChar) {
         prevChar = '';
       }
       keepPrevChar = false;
+
       // escape
       if (token = this.tokenizer.escape(src)) {
         src = src.substring(token.raw.length);
@@ -1757,16 +1745,8 @@ var Lexer_1 = class Lexer {
         continue;
       }
 
-      // strong
-      if (token = this.tokenizer.strong(src, maskedSrc, prevChar)) {
-        src = src.substring(token.raw.length);
-        token.tokens = this.inlineTokens(token.text, [], inLink, inRawBlock);
-        tokens.push(token);
-        continue;
-      }
-
-      // em
-      if (token = this.tokenizer.em(src, maskedSrc, prevChar)) {
+      // em & strong
+      if (token = this.tokenizer.emStrong(src, maskedSrc, prevChar)) {
         src = src.substring(token.raw.length);
         token.tokens = this.inlineTokens(token.text, [], inLink, inRawBlock);
         tokens.push(token);
@@ -1812,7 +1792,9 @@ var Lexer_1 = class Lexer {
       // text
       if (token = this.tokenizer.inlineText(src, inRawBlock, smartypants)) {
         src = src.substring(token.raw.length);
-        prevChar = token.raw.slice(-1);
+        if (token.raw.slice(-1) !== '_') { // Track prevChar before string of ____ started
+          prevChar = token.raw.slice(-1);
+        }
         keepPrevChar = true;
         lastToken = tokens[tokens.length - 1];
         if (lastToken && lastToken.type === 'text') {
diff --git a/lib/marked.js b/lib/marked.js
index 904a9f1077..731b513a4f 100644
--- a/lib/marked.js
+++ b/lib/marked.js
@@ -937,54 +937,66 @@
       }
     };
 
-    _proto.strong = function strong(src, maskedSrc, prevChar) {
+    _proto.emStrong = function emStrong(src, maskedSrc, prevChar) {
       if (prevChar === void 0) {
         prevChar = '';
       }
 
-      var match = this.rules.inline.strong.start.exec(src);
+      var match = this.rules.inline.emStrong.lDelim.exec(src);
+      if (!match) return;
+      if (match[3] && prevChar.match(/(?:[0-9A-Za-z\xAA\xB2\xB3\xB5\xB9\xBA\xBC-\xBE\xC0-\xD6\xD8-\xF6\xF8-\u02C1\u02C6-\u02D1\u02E0-\u02E4\u02EC\u02EE\u0370-\u0374\u0376\u0377\u037A-\u037D\u037F\u0386\u0388-\u038A\u038C\u038E-\u03A1\u03A3-\u03F5\u03F7-\u0481\u048A-\u052F\u0531-\u0556\u0559\u0560-\u0588\u05D0-\u05EA\u05EF-\u05F2\u0620-\u064A\u0660-\u0669\u066E\u066F\u0671-\u06D3\u06D5\u06E5\u06E6\u06EE-\u06FC\u06FF\u0710\u0712-\u072F\u074D-\u07A5\u07B1\u07C0-\u07EA\u07F4\u07F5\u07FA\u0800-\u0815\u081A\u0824\u0828\u0840-\u0858\u0860-\u086A\u08A0-\u08B4\u08B6-\u08C7\u0904-\u0939\u093D\u0950\u0958-\u0961\u0966-\u096F\u0971-\u0980\u0985-\u098C\u098F\u0990\u0993-\u09A8\u09AA-\u09B0\u09B2\u09B6-\u09B9\u09BD\u09CE\u09DC\u09DD\u09DF-\u09E1\u09E6-\u09F1\u09F4-\u09F9\u09FC\u0A05-\u0A0A\u0A0F\u0A10\u0A13-\u0A28\u0A2A-\u0A30\u0A32\u0A33\u0A35\u0A36\u0A38\u0A39\u0A59-\u0A5C\u0A5E\u0A66-\u0A6F\u0A72-\u0A74\u0A85-\u0A8D\u0A8F-\u0A91\u0A93-\u0AA8\u0AAA-\u0AB0\u0AB2\u0AB3\u0AB5-\u0AB9\u0ABD\u0AD0\u0AE0\u0AE1\u0AE6-\u0AEF\u0AF9\u0B05-\u0B0C\u0B0F\u0B10\u0B13-\u0B28\u0B2A-\u0B30\u0B32\u0B33\u0B35-\u0B39\u0B3D\u0B5C\u0B5D\u0B5F-\u0B61\u0B66-\u0B6F\u0B71-\u0B77\u0B83\u0B85-\u0B8A\u0B8E-\u0B90\u0B92-\u0B95\u0B99\u0B9A\u0B9C\u0B9E\u0B9F\u0BA3\u0BA4\u0BA8-\u0BAA\u0BAE-\u0BB9\u0BD0\u0BE6-\u0BF2\u0C05-\u0C0C\u0C0E-\u0C10\u0C12-\u0C28\u0C2A-\u0C39\u0C3D\u0C58-\u0C5A\u0C60\u0C61\u0C66-\u0C6F\u0C78-\u0C7E\u0C80\u0C85-\u0C8C\u0C8E-\u0C90\u0C92-\u0CA8\u0CAA-\u0CB3\u0CB5-\u0CB9\u0CBD\u0CDE\u0CE0\u0CE1\u0CE6-\u0CEF\u0CF1\u0CF2\u0D04-\u0D0C\u0D0E-\u0D10\u0D12-\u0D3A\u0D3D\u0D4E\u0D54-\u0D56\u0D58-\u0D61\u0D66-\u0D78\u0D7A-\u0D7F\u0D85-\u0D96\u0D9A-\u0DB1\u0DB3-\u0DBB\u0DBD\u0DC0-\u0DC6\u0DE6-\u0DEF\u0E01-\u0E30\u0E32\u0E33\u0E40-\u0E46\u0E50-\u0E59\u0E81\u0E82\u0E84\u0E86-\u0E8A\u0E8C-\u0EA3\u0EA5\u0EA7-\u0EB0\u0EB2\u0EB3\u0EBD\u0EC0-\u0EC4\u0EC6\u0ED0-\u0ED9\u0EDC-\u0EDF\u0F00\u0F20-\u0F33\u0F40-\u0F47\u0F49-\u0F6C\u0F88-\u0F8C\u1000-\u102A\u103F-\u1049\u1050-\u1055\u105A-\u105D\u1061\u1065\u1066\u106E-\u1070\u1075-\u1081\u108E\u1090-\u1099\u10A0-\u10C5\u10C7\u10CD\u10D0-\u10FA\u10FC-\u1248\u124A-\u124D\u1250-\u1256\u1258\u125A-\u125D\u1260-\u1288\u128A-\u128D\u1290-\u12B0\u12B2-\u12B5\u12B8-\u12BE\u12C0\u12C2-\u12C5\u12C8-\u12D6\u12D8-\u1310\u1312-\u1315\u1318-\u135A\u1369-\u137C\u1380-\u138F\u13A0-\u13F5\u13F8-\u13FD\u1401-\u166C\u166F-\u167F\u1681-\u169A\u16A0-\u16EA\u16EE-\u16F8\u1700-\u170C\u170E-\u1711\u1720-\u1731\u1740-\u1751\u1760-\u176C\u176E-\u1770\u1780-\u17B3\u17D7\u17DC\u17E0-\u17E9\u17F0-\u17F9\u1810-\u1819\u1820-\u1878\u1880-\u1884\u1887-\u18A8\u18AA\u18B0-\u18F5\u1900-\u191E\u1946-\u196D\u1970-\u1974\u1980-\u19AB\u19B0-\u19C9\u19D0-\u19DA\u1A00-\u1A16\u1A20-\u1A54\u1A80-\u1A89\u1A90-\u1A99\u1AA7\u1B05-\u1B33\u1B45-\u1B4B\u1B50-\u1B59\u1B83-\u1BA0\u1BAE-\u1BE5\u1C00-\u1C23\u1C40-\u1C49\u1C4D-\u1C7D\u1C80-\u1C88\u1C90-\u1CBA\u1CBD-\u1CBF\u1CE9-\u1CEC\u1CEE-\u1CF3\u1CF5\u1CF6\u1CFA\u1D00-\u1DBF\u1E00-\u1F15\u1F18-\u1F1D\u1F20-\u1F45\u1F48-\u1F4D\u1F50-\u1F57\u1F59\u1F5B\u1F5D\u1F5F-\u1F7D\u1F80-\u1FB4\u1FB6-\u1FBC\u1FBE\u1FC2-\u1FC4\u1FC6-\u1FCC\u1FD0-\u1FD3\u1FD6-\u1FDB\u1FE0-\u1FEC\u1FF2-\u1FF4\u1FF6-\u1FFC\u2070\u2071\u2074-\u2079\u207F-\u2089\u2090-\u209C\u2102\u2107\u210A-\u2113\u2115\u2119-\u211D\u2124\u2126\u2128\u212A-\u212D\u212F-\u2139\u213C-\u213F\u2145-\u2149\u214E\u2150-\u2189\u2460-\u249B\u24EA-\u24FF\u2776-\u2793\u2C00-\u2C2E\u2C30-\u2C5E\u2C60-\u2CE4\u2CEB-\u2CEE\u2CF2\u2CF3\u2CFD\u2D00-\u2D25\u2D27\u2D2D\u2D30-\u2D67\u2D6F\u2D80-\u2D96\u2DA0-\u2DA6\u2DA8-\u2DAE\u2DB0-\u2DB6\u2DB8-\u2DBE\u2DC0-\u2DC6\u2DC8-\u2DCE\u2DD0-\u2DD6\u2DD8-\u2DDE\u2E2F\u3005-\u3007\u3021-\u3029\u3031-\u3035\u3038-\u303C\u3041-\u3096\u309D-\u309F\u30A1-\u30FA\u30FC-\u30FF\u3105-\u312F\u3131-\u318E\u3192-\u3195\u31A0-\u31BF\u31F0-\u31FF\u3220-\u3229\u3248-\u324F\u3251-\u325F\u3280-\u3289\u32B1-\u32BF\u3400-\u4DBF\u4E00-\u9FFC\uA000-\uA48C\uA4D0-\uA4FD\uA500-\uA60C\uA610-\uA62B\uA640-\uA66E\uA67F-\uA69D\uA6A0-\uA6EF\uA717-\uA71F\uA722-\uA788\uA78B-\uA7BF\uA7C2-\uA7CA\uA7F5-\uA801\uA803-\uA805\uA807-\uA80A\uA80C-\uA822\uA830-\uA835\uA840-\uA873\uA882-\uA8B3\uA8D0-\uA8D9\uA8F2-\uA8F7\uA8FB\uA8FD\uA8FE\uA900-\uA925\uA930-\uA946\uA960-\uA97C\uA984-\uA9B2\uA9CF-\uA9D9\uA9E0-\uA9E4\uA9E6-\uA9FE\uAA00-\uAA28\uAA40-\uAA42\uAA44-\uAA4B\uAA50-\uAA59\uAA60-\uAA76\uAA7A\uAA7E-\uAAAF\uAAB1\uAAB5\uAAB6\uAAB9-\uAABD\uAAC0\uAAC2\uAADB-\uAADD\uAAE0-\uAAEA\uAAF2-\uAAF4\uAB01-\uAB06\uAB09-\uAB0E\uAB11-\uAB16\uAB20-\uAB26\uAB28-\uAB2E\uAB30-\uAB5A\uAB5C-\uAB69\uAB70-\uABE2\uABF0-\uABF9\uAC00-\uD7A3\uD7B0-\uD7C6\uD7CB-\uD7FB\uF900-\uFA6D\uFA70-\uFAD9\uFB00-\uFB06\uFB13-\uFB17\uFB1D\uFB1F-\uFB28\uFB2A-\uFB36\uFB38-\uFB3C\uFB3E\uFB40\uFB41\uFB43\uFB44\uFB46-\uFBB1\uFBD3-\uFD3D\uFD50-\uFD8F\uFD92-\uFDC7\uFDF0-\uFDFB\uFE70-\uFE74\uFE76-\uFEFC\uFF10-\uFF19\uFF21-\uFF3A\uFF41-\uFF5A\uFF66-\uFFBE\uFFC2-\uFFC7\uFFCA-\uFFCF\uFFD2-\uFFD7\uFFDA-\uFFDC]|\uD800[\uDC00-\uDC0B\uDC0D-\uDC26\uDC28-\uDC3A\uDC3C\uDC3D\uDC3F-\uDC4D\uDC50-\uDC5D\uDC80-\uDCFA\uDD07-\uDD33\uDD40-\uDD78\uDD8A\uDD8B\uDE80-\uDE9C\uDEA0-\uDED0\uDEE1-\uDEFB\uDF00-\uDF23\uDF2D-\uDF4A\uDF50-\uDF75\uDF80-\uDF9D\uDFA0-\uDFC3\uDFC8-\uDFCF\uDFD1-\uDFD5]|\uD801[\uDC00-\uDC9D\uDCA0-\uDCA9\uDCB0-\uDCD3\uDCD8-\uDCFB\uDD00-\uDD27\uDD30-\uDD63\uDE00-\uDF36\uDF40-\uDF55\uDF60-\uDF67]|\uD802[\uDC00-\uDC05\uDC08\uDC0A-\uDC35\uDC37\uDC38\uDC3C\uDC3F-\uDC55\uDC58-\uDC76\uDC79-\uDC9E\uDCA7-\uDCAF\uDCE0-\uDCF2\uDCF4\uDCF5\uDCFB-\uDD1B\uDD20-\uDD39\uDD80-\uDDB7\uDDBC-\uDDCF\uDDD2-\uDE00\uDE10-\uDE13\uDE15-\uDE17\uDE19-\uDE35\uDE40-\uDE48\uDE60-\uDE7E\uDE80-\uDE9F\uDEC0-\uDEC7\uDEC9-\uDEE4\uDEEB-\uDEEF\uDF00-\uDF35\uDF40-\uDF55\uDF58-\uDF72\uDF78-\uDF91\uDFA9-\uDFAF]|\uD803[\uDC00-\uDC48\uDC80-\uDCB2\uDCC0-\uDCF2\uDCFA-\uDD23\uDD30-\uDD39\uDE60-\uDE7E\uDE80-\uDEA9\uDEB0\uDEB1\uDF00-\uDF27\uDF30-\uDF45\uDF51-\uDF54\uDFB0-\uDFCB\uDFE0-\uDFF6]|\uD804[\uDC03-\uDC37\uDC52-\uDC6F\uDC83-\uDCAF\uDCD0-\uDCE8\uDCF0-\uDCF9\uDD03-\uDD26\uDD36-\uDD3F\uDD44\uDD47\uDD50-\uDD72\uDD76\uDD83-\uDDB2\uDDC1-\uDDC4\uDDD0-\uDDDA\uDDDC\uDDE1-\uDDF4\uDE00-\uDE11\uDE13-\uDE2B\uDE80-\uDE86\uDE88\uDE8A-\uDE8D\uDE8F-\uDE9D\uDE9F-\uDEA8\uDEB0-\uDEDE\uDEF0-\uDEF9\uDF05-\uDF0C\uDF0F\uDF10\uDF13-\uDF28\uDF2A-\uDF30\uDF32\uDF33\uDF35-\uDF39\uDF3D\uDF50\uDF5D-\uDF61]|\uD805[\uDC00-\uDC34\uDC47-\uDC4A\uDC50-\uDC59\uDC5F-\uDC61\uDC80-\uDCAF\uDCC4\uDCC5\uDCC7\uDCD0-\uDCD9\uDD80-\uDDAE\uDDD8-\uDDDB\uDE00-\uDE2F\uDE44\uDE50-\uDE59\uDE80-\uDEAA\uDEB8\uDEC0-\uDEC9\uDF00-\uDF1A\uDF30-\uDF3B]|\uD806[\uDC00-\uDC2B\uDCA0-\uDCF2\uDCFF-\uDD06\uDD09\uDD0C-\uDD13\uDD15\uDD16\uDD18-\uDD2F\uDD3F\uDD41\uDD50-\uDD59\uDDA0-\uDDA7\uDDAA-\uDDD0\uDDE1\uDDE3\uDE00\uDE0B-\uDE32\uDE3A\uDE50\uDE5C-\uDE89\uDE9D\uDEC0-\uDEF8]|\uD807[\uDC00-\uDC08\uDC0A-\uDC2E\uDC40\uDC50-\uDC6C\uDC72-\uDC8F\uDD00-\uDD06\uDD08\uDD09\uDD0B-\uDD30\uDD46\uDD50-\uDD59\uDD60-\uDD65\uDD67\uDD68\uDD6A-\uDD89\uDD98\uDDA0-\uDDA9\uDEE0-\uDEF2\uDFB0\uDFC0-\uDFD4]|\uD808[\uDC00-\uDF99]|\uD809[\uDC00-\uDC6E\uDC80-\uDD43]|[\uD80C\uD81C-\uD820\uD822\uD840-\uD868\uD86A-\uD86C\uD86F-\uD872\uD874-\uD879\uD880-\uD883][\uDC00-\uDFFF]|\uD80D[\uDC00-\uDC2E]|\uD811[\uDC00-\uDE46]|\uD81A[\uDC00-\uDE38\uDE40-\uDE5E\uDE60-\uDE69\uDED0-\uDEED\uDF00-\uDF2F\uDF40-\uDF43\uDF50-\uDF59\uDF5B-\uDF61\uDF63-\uDF77\uDF7D-\uDF8F]|\uD81B[\uDE40-\uDE96\uDF00-\uDF4A\uDF50\uDF93-\uDF9F\uDFE0\uDFE1\uDFE3]|\uD821[\uDC00-\uDFF7]|\uD823[\uDC00-\uDCD5\uDD00-\uDD08]|\uD82C[\uDC00-\uDD1E\uDD50-\uDD52\uDD64-\uDD67\uDD70-\uDEFB]|\uD82F[\uDC00-\uDC6A\uDC70-\uDC7C\uDC80-\uDC88\uDC90-\uDC99]|\uD834[\uDEE0-\uDEF3\uDF60-\uDF78]|\uD835[\uDC00-\uDC54\uDC56-\uDC9C\uDC9E\uDC9F\uDCA2\uDCA5\uDCA6\uDCA9-\uDCAC\uDCAE-\uDCB9\uDCBB\uDCBD-\uDCC3\uDCC5-\uDD05\uDD07-\uDD0A\uDD0D-\uDD14\uDD16-\uDD1C\uDD1E-\uDD39\uDD3B-\uDD3E\uDD40-\uDD44\uDD46\uDD4A-\uDD50\uDD52-\uDEA5\uDEA8-\uDEC0\uDEC2-\uDEDA\uDEDC-\uDEFA\uDEFC-\uDF14\uDF16-\uDF34\uDF36-\uDF4E\uDF50-\uDF6E\uDF70-\uDF88\uDF8A-\uDFA8\uDFAA-\uDFC2\uDFC4-\uDFCB\uDFCE-\uDFFF]|\uD838[\uDD00-\uDD2C\uDD37-\uDD3D\uDD40-\uDD49\uDD4E\uDEC0-\uDEEB\uDEF0-\uDEF9]|\uD83A[\uDC00-\uDCC4\uDCC7-\uDCCF\uDD00-\uDD43\uDD4B\uDD50-\uDD59]|\uD83B[\uDC71-\uDCAB\uDCAD-\uDCAF\uDCB1-\uDCB4\uDD01-\uDD2D\uDD2F-\uDD3D\uDE00-\uDE03\uDE05-\uDE1F\uDE21\uDE22\uDE24\uDE27\uDE29-\uDE32\uDE34-\uDE37\uDE39\uDE3B\uDE42\uDE47\uDE49\uDE4B\uDE4D-\uDE4F\uDE51\uDE52\uDE54\uDE57\uDE59\uDE5B\uDE5D\uDE5F\uDE61\uDE62\uDE64\uDE67-\uDE6A\uDE6C-\uDE72\uDE74-\uDE77\uDE79-\uDE7C\uDE7E\uDE80-\uDE89\uDE8B-\uDE9B\uDEA1-\uDEA3\uDEA5-\uDEA9\uDEAB-\uDEBB]|\uD83C[\uDD00-\uDD0C]|\uD83E[\uDFF0-\uDFF9]|\uD869[\uDC00-\uDEDD\uDF00-\uDFFF]|\uD86D[\uDC00-\uDF34\uDF40-\uDFFF]|\uD86E[\uDC00-\uDC1D\uDC20-\uDFFF]|\uD873[\uDC00-\uDEA1\uDEB0-\uDFFF]|\uD87A[\uDC00-\uDFE0]|\uD87E[\uDC00-\uDE1D]|\uD884[\uDC00-\uDF4A])/)) return; // _ can't be between two alphanumerics. \p{L}\p{N} includes non-english alphabet/numbers as well
 
-      if (match && (!match[1] || match[1] && (prevChar === '' || this.rules.inline.punctuation.exec(prevChar)))) {
-        maskedSrc = maskedSrc.slice(-1 * src.length);
-        var endReg = match[0] === '**' ? this.rules.inline.strong.endAst : this.rules.inline.strong.endUnd;
+      var nextChar = match[1] || match[2] || '';
+
+      if (!nextChar || nextChar && (prevChar === '' || this.rules.inline.punctuation.exec(prevChar))) {
+        var lLength = match[0].length - 1;
+        var rDelim,
+            rLength,
+            delimTotal = lLength,
+            midDelimTotal = 0;
+        var endReg = match[0][0] === '*' ? this.rules.inline.emStrong.rDelimAst : this.rules.inline.emStrong.rDelimUnd;
         endReg.lastIndex = 0;
-        var cap;
+        maskedSrc = maskedSrc.slice(-1 * src.length + lLength); // Bump maskedSrc to same section of string as src (move to lexer?)
 
         while ((match = endReg.exec(maskedSrc)) != null) {
-          cap = this.rules.inline.strong.middle.exec(maskedSrc.slice(0, match.index + 3));
-
-          if (cap) {
-            return {
-              type: 'strong',
-              raw: src.slice(0, cap[0].length),
-              text: src.slice(2, cap[0].length - 2)
-            };
+          rDelim = match[1] || match[2] || match[3] || match[4] || match[5] || match[6];
+          if (!rDelim) continue; // matched the first alternative in rules.js (skip the * in __abc*abc__)
+
+          rLength = rDelim.length;
+
+          if (match[3] || match[4]) {
+            // found another Left Delim
+            delimTotal += rLength;
+            continue;
+          } else if (match[5] || match[6]) {
+            // either Left or Right Delim
+            if (lLength % 3 && !((lLength + rLength) % 3)) {
+              midDelimTotal += rLength;
+              continue; // CommonMark Emphasis Rules 9-10
+            }
           }
-        }
-      }
-    };
 
-    _proto.em = function em(src, maskedSrc, prevChar) {
-      if (prevChar === void 0) {
-        prevChar = '';
-      }
-
-      var match = this.rules.inline.em.start.exec(src);
-
-      if (match && (!match[1] || match[1] && (prevChar === '' || this.rules.inline.punctuation.exec(prevChar)))) {
-        maskedSrc = maskedSrc.slice(-1 * src.length);
-        var endReg = match[0] === '*' ? this.rules.inline.em.endAst : this.rules.inline.em.endUnd;
-        endReg.lastIndex = 0;
-        var cap;
+          delimTotal -= rLength;
+          if (delimTotal > 0) continue; // Haven't found enough closing delimiters
+          // If this is the last rDelimiter, remove extra characters. *a*** -> *a*
 
-        while ((match = endReg.exec(maskedSrc)) != null) {
-          cap = this.rules.inline.em.middle.exec(maskedSrc.slice(0, match.index + 2));
+          if (delimTotal + midDelimTotal - rLength <= 0 && !maskedSrc.slice(endReg.lastIndex).match(endReg)) {
+            rLength = Math.min(rLength, rLength + delimTotal + midDelimTotal);
+          }
 
-          if (cap) {
+          if (Math.min(lLength, rLength) % 2) {
             return {
               type: 'em',
-              raw: src.slice(0, cap[0].length),
-              text: src.slice(1, cap[0].length - 1)
+              raw: src.slice(0, lLength + match.index + rLength + 1),
+              text: src.slice(1, lLength + match.index + rLength)
+            };
+          }
+
+          if (Math.min(lLength, rLength) % 2 === 0) {
+            return {
+              type: 'strong',
+              raw: src.slice(0, lLength + match.index + rLength + 1),
+              text: src.slice(2, lLength + match.index + rLength - 1)
             };
           }
         }
@@ -1233,48 +1245,31 @@
     reflink: /^!?\[(label)\]\[(?!\s*\])((?:\\[\[\]]?|[^\[\]\\])+)\]/,
     nolink: /^!?\[(?!\s*\])((?:\[[^\[\]]*\]|\\[\[\]]|[^\[\]])*)\](?:\[\])?/,
     reflinkSearch: 'reflink|nolink(?!\\()',
-    strong: {
-      start: /^(?:(\*\*(?=[*punctuation]))|\*\*)(?![\s])|__/,
-      // (1) returns if starts w/ punctuation
-      middle: /^\*\*(?:(?:(?!overlapSkip)(?:[^*]|\\\*)|overlapSkip)|\*(?:(?!overlapSkip)(?:[^*]|\\\*)|overlapSkip)*?\*)+?\*\*$|^__(?![\s])((?:(?:(?!overlapSkip)(?:[^_]|\\_)|overlapSkip)|_(?:(?!overlapSkip)(?:[^_]|\\_)|overlapSkip)*?_)+?)__$/,
-      endAst: /[^punctuation\s]\*\*(?!\*)|[punctuation]\*\*(?!\*)(?:(?=[punctuation_\s]|$))/,
-      // last char can't be punct, or final * must also be followed by punct (or endline)
-      endUnd: /[^\s]__(?!_)(?:(?=[punctuation*\s])|$)/ // last char can't be a space, and final _ must preceed punct or \s (or endline)
-
-    },
-    em: {
-      start: /^(?:(\*(?=[punctuation]))|\*)(?![*\s])|_/,
-      // (1) returns if starts w/ punctuation
-      middle: /^\*(?:(?:(?!overlapSkip)(?:[^*]|\\\*)|overlapSkip)|\*(?:(?!overlapSkip)(?:[^*]|\\\*)|overlapSkip)*?\*)+?\*$|^_(?![_\s])(?:(?:(?!overlapSkip)(?:[^_]|\\_)|overlapSkip)|_(?:(?!overlapSkip)(?:[^_]|\\_)|overlapSkip)*?_)+?_$/,
-      endAst: /[^punctuation\s]\*(?!\*)|[punctuation]\*(?!\*)(?:(?=[punctuation_\s]|$))/,
-      // last char can't be punct, or final * must also be followed by punct (or endline)
-      endUnd: /[^\s]_(?!_)(?:(?=[punctuation*\s])|$)/ // last char can't be a space, and final _ must preceed punct or \s (or endline)
+    emStrong: {
+      lDelim: /^(?:\*+(?:([punct_])|[^\s*]))|^_+(?:([punct*])|([^\s_]))/,
+      //        (1) and (2) can only be a Right Delimiter. (3) and (4) can only be Left.  (5) and (6) can be either Left or Right.
+      //        () Skip other delimiter (1) #***                (2) a***#, a***                   (3) #***a, ***a                 (4) ***#              (5) #***#                 (6) a***a
+      rDelimAst: /\_\_[^_]*?\*[^_]*?\_\_|[punct_](\*+)(?=[\s]|$)|[^punct*_\s](\*+)(?=[punct_\s]|$)|[punct_\s](\*+)(?=[^punct*_\s])|[\s](\*+)(?=[punct_])|[punct_](\*+)(?=[punct_])|[^punct*_\s](\*+)(?=[^punct*_\s])/,
+      rDelimUnd: /\*\*[^*]*?\_[^*]*?\*\*|[punct*](\_+)(?=[\s]|$)|[^punct*_\s](\_+)(?=[punct*\s]|$)|[punct*\s](\_+)(?=[^punct*_\s])|[\s](\_+)(?=[punct*])|[punct*](\_+)(?=[punct*])/ // ^- Not allowed for _
 
     },
     code: /^(`+)([^`]|[^`][\s\S]*?[^`])\1(?!`)/,
     br: /^( {2,}|\\)\n(?!\s*$)/,
     del: noopTest$1,
-    text: /^(`+|[^`])(?:(?= {2,}\n)|[\s\S]*?(?:(?=[\\<!\[`*]|\b_|$)|[^ ](?= {2,}\n)))/,
-    punctuation: /^([\s*punctuation])/
-  }; // list of punctuation marks from common mark spec
-  // without * and _ to workaround cases with double emphasis
+    text: /^(`+|[^`])(?:(?= {2,}\n)|[\s\S]*?(?:(?=[\\<!\[`*_]|\b_|$)|[^ ](?= {2,}\n)))/,
+    punctuation: /^([\spunctuation])/
+  }; // list of punctuation marks from CommonMark spec
+  // without * and _ to handle the different emphasis markers * and _
 
   inline._punctuation = '!"#$%&\'()+\\-.,/:;<=>?@\\[\\]`^{|}~';
   inline.punctuation = edit$1(inline.punctuation).replace(/punctuation/g, inline._punctuation).getRegex(); // sequences em should skip over [title](link), `code`, <html>
 
-  inline._blockSkip = '\\[[^\\]]*?\\]\\([^\\)]*?\\)|`[^`]*?`|<[^>]*?>';
-  inline._overlapSkip = '__[^_]*?__|\\*\\*\\[^\\*\\]*?\\*\\*';
+  inline.blockSkip = /\[[^\]]*?\]\([^\)]*?\)|`[^`]*?`|<[^>]*?>/g;
+  inline.escapedEmSt = /\\\*|\\_/g;
   inline._comment = edit$1(block._comment).replace('(?:-->|$)', '-->').getRegex();
-  inline.em.start = edit$1(inline.em.start).replace(/punctuation/g, inline._punctuation).getRegex();
-  inline.em.middle = edit$1(inline.em.middle).replace(/punctuation/g, inline._punctuation).replace(/overlapSkip/g, inline._overlapSkip).getRegex();
-  inline.em.endAst = edit$1(inline.em.endAst, 'g').replace(/punctuation/g, inline._punctuation).getRegex();
-  inline.em.endUnd = edit$1(inline.em.endUnd, 'g').replace(/punctuation/g, inline._punctuation).getRegex();
-  inline.strong.start = edit$1(inline.strong.start).replace(/punctuation/g, inline._punctuation).getRegex();
-  inline.strong.middle = edit$1(inline.strong.middle).replace(/punctuation/g, inline._punctuation).replace(/overlapSkip/g, inline._overlapSkip).getRegex();
-  inline.strong.endAst = edit$1(inline.strong.endAst, 'g').replace(/punctuation/g, inline._punctuation).getRegex();
-  inline.strong.endUnd = edit$1(inline.strong.endUnd, 'g').replace(/punctuation/g, inline._punctuation).getRegex();
-  inline.blockSkip = edit$1(inline._blockSkip, 'g').getRegex();
-  inline.overlapSkip = edit$1(inline._overlapSkip, 'g').getRegex();
+  inline.emStrong.lDelim = edit$1(inline.emStrong.lDelim).replace(/punct/g, inline._punctuation).getRegex();
+  inline.emStrong.rDelimAst = edit$1(inline.emStrong.rDelimAst, 'g').replace(/punct/g, inline._punctuation).getRegex();
+  inline.emStrong.rDelimUnd = edit$1(inline.emStrong.rDelimUnd, 'g').replace(/punct/g, inline._punctuation).getRegex();
   inline._escapes = /\\([!"#$%&'()*+,\-./:;<=>?@\[\]\\^_`{|}~])/g;
   inline._scheme = /[a-zA-Z][a-zA-Z0-9+.-]{1,31}/;
   inline._email = /[a-zA-Z0-9.!#$%&'*+/=?^_`{|}~-]+(@)[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?(?:\.[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?)+(?![-_])/;
@@ -1322,7 +1317,7 @@
     url: /^((?:ftp|https?):\/\/|www\.)(?:[a-zA-Z0-9\-]+\.?)+[^\s<]*|^email/,
     _backpedal: /(?:[^?!.,:;*_~()&]+|\([^)]*\)|&(?![a-zA-Z0-9]+;$)|[?!.,:;*_~)]+(?!$))+/,
     del: /^(~~?)(?=[^\s~])([\s\S]*?[^\s~])\1(?=[^~]|$)/,
-    text: /^([`~]+|[^`~])(?:(?= {2,}\n)|[\s\S]*?(?:(?=[\\<!\[`*~]|\b_|https?:\/\/|ftp:\/\/|www\.|$)|[^ ](?= {2,}\n)|[^a-zA-Z0-9.!#$%&'*+\/=?_`{\|}~-](?=[a-zA-Z0-9.!#$%&'*+\/=?_`{\|}~-]+@))|(?=[a-zA-Z0-9.!#$%&'*+\/=?_`{\|}~-]+@))/
+    text: /^([`~]+|[^`~])(?:(?= {2,}\n)|[\s\S]*?(?:(?=[\\<!\[`*~_]|\b_|https?:\/\/|ftp:\/\/|www\.|$)|[^ ](?= {2,}\n)|[^a-zA-Z0-9.!#$%&'*+\/=?_`{\|}~-](?=[a-zA-Z0-9.!#$%&'*+\/=?_`{\|}~-]+@))|(?=[a-zA-Z0-9.!#$%&'*+\/=?_`{\|}~-]+@))/
   });
   inline.gfm.url = edit$1(inline.gfm.url, 'i').replace('email', inline.gfm._extended_email).getRegex();
   /**
@@ -1721,6 +1716,11 @@
 
       while ((match = this.tokenizer.rules.inline.blockSkip.exec(maskedSrc)) != null) {
         maskedSrc = maskedSrc.slice(0, match.index) + '[' + repeatString$1('a', match[0].length - 2) + ']' + maskedSrc.slice(this.tokenizer.rules.inline.blockSkip.lastIndex);
+      } // Mask out escaped em & strong delimiters
+
+
+      while ((match = this.tokenizer.rules.inline.escapedEmSt.exec(maskedSrc)) != null) {
+        maskedSrc = maskedSrc.slice(0, match.index) + '++' + maskedSrc.slice(this.tokenizer.rules.inline.escapedEmSt.lastIndex);
       }
 
       while (src) {
@@ -1781,18 +1781,10 @@
           }
 
           continue;
-        } // strong
+        } // em & strong
 
 
-        if (token = this.tokenizer.strong(src, maskedSrc, prevChar)) {
-          src = src.substring(token.raw.length);
-          token.tokens = this.inlineTokens(token.text, [], inLink, inRawBlock);
-          tokens.push(token);
-          continue;
-        } // em
-
-
-        if (token = this.tokenizer.em(src, maskedSrc, prevChar)) {
+        if (token = this.tokenizer.emStrong(src, maskedSrc, prevChar)) {
           src = src.substring(token.raw.length);
           token.tokens = this.inlineTokens(token.text, [], inLink, inRawBlock);
           tokens.push(token);
@@ -1838,7 +1830,12 @@
 
         if (token = this.tokenizer.inlineText(src, inRawBlock, smartypants)) {
           src = src.substring(token.raw.length);
-          prevChar = token.raw.slice(-1);
+
+          if (token.raw.slice(-1) !== '_') {
+            // Track prevChar before string of ____ started
+            prevChar = token.raw.slice(-1);
+          }
+
           keepPrevChar = true;
           lastToken = tokens[tokens.length - 1];
 
diff --git a/marked.min.js b/marked.min.js
index 10e78525f2..46bf2d712e 100644
--- a/marked.min.js
+++ b/marked.min.js
@@ -3,4 +3,4 @@
  * Copyright (c) 2011-2021, Christopher Jeffrey. (MIT Licensed)
  * https://github.com/markedjs/marked
  */
-!function(e,t){"object"==typeof exports&&"undefined"!=typeof module?module.exports=t():"function"==typeof define&&define.amd?define(t):(e="undefined"!=typeof globalThis?globalThis:e||self).marked=t()}(this,function(){"use strict";function i(e,t){for(var n=0;n<t.length;n++){var r=t[n];r.enumerable=r.enumerable||!1,r.configurable=!0,"value"in r&&(r.writable=!0),Object.defineProperty(e,r.key,r)}}function s(e,t){(null==t||t>e.length)&&(t=e.length);for(var n=0,r=new Array(t);n<t;n++)r[n]=e[n];return r}function p(e,t){var n;if("undefined"!=typeof Symbol&&null!=e[Symbol.iterator])return(n=e[Symbol.iterator]()).next.bind(n);if(Array.isArray(e)||(n=function(e,t){if(e){if("string"==typeof e)return s(e,t);var n=Object.prototype.toString.call(e).slice(8,-1);return"Map"===(n="Object"===n&&e.constructor?e.constructor.name:n)||"Set"===n?Array.from(e):"Arguments"===n||/^(?:Ui|I)nt(?:8|16|32)(?:Clamped)?Array$/.test(n)?s(e,t):void 0}}(e))||t&&e&&"number"==typeof e.length){n&&(e=n);var r=0;return function(){return r>=e.length?{done:!0}:{done:!1,value:e[r++]}}}throw new TypeError("Invalid attempt to iterate non-iterable instance.\nIn order to be iterable, non-array objects must have a [Symbol.iterator]() method.")}function n(e){return c[e]}var e,t=(function(t){function e(){return{baseUrl:null,breaks:!1,gfm:!0,headerIds:!0,headerPrefix:"",highlight:null,langPrefix:"language-",mangle:!0,pedantic:!1,renderer:null,sanitize:!1,sanitizer:null,silent:!1,smartLists:!1,smartypants:!1,tokenizer:null,walkTokens:null,xhtml:!1}}t.exports={defaults:e(),getDefaults:e,changeDefaults:function(e){t.exports.defaults=e}}}(e={exports:{}}),e.exports),r=/[&<>"']/,l=/[&<>"']/g,a=/[<>"']|&(?!#?\w+;)/,o=/[<>"']|&(?!#?\w+;)/g,c={"&":"&amp;","<":"&lt;",">":"&gt;",'"':"&quot;","'":"&#39;"};var u=/&(#(?:\d+)|(?:#x[0-9A-Fa-f]+)|(?:\w+));?/gi;function h(e){return e.replace(u,function(e,t){return"colon"===(t=t.toLowerCase())?":":"#"===t.charAt(0)?"x"===t.charAt(1)?String.fromCharCode(parseInt(t.substring(2),16)):String.fromCharCode(+t.substring(1)):""})}var g=/(^|[^\[])\^/g;var f=/[^\w:]/g,d=/^$|^[a-z][a-z0-9+.-]*:|^[?#]/i;var k={},b=/^[^:]+:\/*[^/]*$/,m=/^([^:]+:)[\s\S]*$/,x=/^([^:]+:\/*[^/]*)[\s\S]*$/;function w(e,t){k[" "+e]||(b.test(e)?k[" "+e]=e+"/":k[" "+e]=v(e,"/",!0));var n=-1===(e=k[" "+e]).indexOf(":");return"//"===t.substring(0,2)?n?t:e.replace(m,"$1")+t:"/"===t.charAt(0)?n?t:e.replace(x,"$1")+t:e+t}function v(e,t,n){var r=e.length;if(0===r)return"";for(var i=0;i<r;){var s=e.charAt(r-i-1);if(s!==t||n){if(s===t||!n)break;i++}else i++}return e.substr(0,r-i)}var _=function(e,t){if(t){if(r.test(e))return e.replace(l,n)}else if(a.test(e))return e.replace(o,n);return e},y=h,z=function(n,e){n=n.source||n,e=e||"";var r={replace:function(e,t){return t=(t=t.source||t).replace(g,"$1"),n=n.replace(e,t),r},getRegex:function(){return new RegExp(n,e)}};return r},$=function(e,t,n){if(e){var r;try{r=decodeURIComponent(h(n)).replace(f,"").toLowerCase()}catch(e){return null}if(0===r.indexOf("javascript:")||0===r.indexOf("vbscript:")||0===r.indexOf("data:"))return null}t&&!d.test(n)&&(n=w(t,n));try{n=encodeURI(n).replace(/%25/g,"%")}catch(e){return null}return n},S={exec:function(){}},A=function(e){for(var t,n,r=1;r<arguments.length;r++)for(n in t=arguments[r])Object.prototype.hasOwnProperty.call(t,n)&&(e[n]=t[n]);return e},R=function(e,t){var n=e.replace(/\|/g,function(e,t,n){for(var r=!1,i=t;0<=--i&&"\\"===n[i];)r=!r;return r?"|":" |"}).split(/ \|/),r=0;if(n.length>t)n.splice(t);else for(;n.length<t;)n.push("");for(;r<n.length;r++)n[r]=n[r].trim().replace(/\\\|/g,"|");return n},T=function(e,t){if(-1===e.indexOf(t[1]))return-1;for(var n=e.length,r=0,i=0;i<n;i++)if("\\"===e[i])i++;else if(e[i]===t[0])r++;else if(e[i]===t[1]&&--r<0)return i;return-1},I=function(e){e&&e.sanitize&&!e.silent&&console.warn("marked(): sanitize and sanitizer parameters are deprecated since version 0.7.0, should not be used and will be removed in the future. Read more here: https://marked.js.org/#/USING_ADVANCED.md#options")},Z=function(e,t){if(t<1)return"";for(var n="";1<t;)1&t&&(n+=e),t>>=1,e+=e;return n+e},q=t.defaults,O=v,C=R,U=_,j=T;function E(e,t,n){var r=t.href,i=t.title?U(t.title):null,t=e[1].replace(/\\([\[\]])/g,"$1");return"!"!==e[0].charAt(0)?{type:"link",raw:n,href:r,title:i,text:t}:{type:"image",raw:n,href:r,title:i,text:U(t)}}var P=function(){function e(e){this.options=e||q}var t=e.prototype;return t.space=function(e){e=this.rules.block.newline.exec(e);if(e)return 1<e[0].length?{type:"space",raw:e[0]}:{raw:"\n"}},t.code=function(e,t){e=this.rules.block.code.exec(e);if(e){t=t[t.length-1];if(t&&"paragraph"===t.type)return{raw:e[0],text:e[0].trimRight()};t=e[0].replace(/^ {1,4}/gm,"");return{type:"code",raw:e[0],codeBlockStyle:"indented",text:this.options.pedantic?t:O(t,"\n")}}},t.fences=function(e){var t=this.rules.block.fences.exec(e);if(t){var n=t[0],e=function(e,t){if(null===(e=e.match(/^(\s+)(?:```)/)))return t;var n=e[1];return t.split("\n").map(function(e){var t=e.match(/^\s+/);return null!==t&&t[0].length>=n.length?e.slice(n.length):e}).join("\n")}(n,t[3]||"");return{type:"code",raw:n,lang:t[2]&&t[2].trim(),text:e}}},t.heading=function(e){var t=this.rules.block.heading.exec(e);if(t){var n=t[2].trim();return/#$/.test(n)&&(e=O(n,"#"),!this.options.pedantic&&e&&!/ $/.test(e)||(n=e.trim())),{type:"heading",raw:t[0],depth:t[1].length,text:n}}},t.nptable=function(e){e=this.rules.block.nptable.exec(e);if(e){var t={type:"table",header:C(e[1].replace(/^ *| *\| *$/g,"")),align:e[2].replace(/^ *|\| *$/g,"").split(/ *\| */),cells:e[3]?e[3].replace(/\n$/,"").split("\n"):[],raw:e[0]};if(t.header.length===t.align.length){for(var n=t.align.length,r=0;r<n;r++)/^ *-+: *$/.test(t.align[r])?t.align[r]="right":/^ *:-+: *$/.test(t.align[r])?t.align[r]="center":/^ *:-+ *$/.test(t.align[r])?t.align[r]="left":t.align[r]=null;for(n=t.cells.length,r=0;r<n;r++)t.cells[r]=C(t.cells[r],t.header.length);return t}}},t.hr=function(e){e=this.rules.block.hr.exec(e);if(e)return{type:"hr",raw:e[0]}},t.blockquote=function(e){var t=this.rules.block.blockquote.exec(e);if(t){e=t[0].replace(/^ *> ?/gm,"");return{type:"blockquote",raw:t[0],text:e}}},t.list=function(e){e=this.rules.block.list.exec(e);if(e){for(var t,n,r,i,s,l=e[0],a=e[2],o=1<a.length,c={type:"list",raw:l,ordered:o,start:o?+a.slice(0,-1):"",loose:!1,items:[]},u=e[0].match(this.rules.block.item),p=!1,h=u.length,g=this.rules.block.listItemStart.exec(u[0]),f=0;f<h;f++){if(l=t=u[f],f!==h-1){if(r=this.rules.block.listItemStart.exec(u[f+1]),this.options.pedantic?r[1].length>g[1].length:r[1].length>g[0].length||3<r[1].length){u.splice(f,2,u[f]+"\n"+u[f+1]),f--,h--;continue}(!this.options.pedantic||this.options.smartLists?r[2][r[2].length-1]!==a[a.length-1]:o==(1===r[2].length))&&(n=u.slice(f+1).join("\n"),c.raw=c.raw.substring(0,c.raw.length-n.length),f=h-1),g=r}r=t.length,~(t=t.replace(/^ *([*+-]|\d+[.)]) ?/,"")).indexOf("\n ")&&(r-=t.length,t=this.options.pedantic?t.replace(/^ {1,4}/gm,""):t.replace(new RegExp("^ {1,"+r+"}","gm"),"")),r=p||/\n\n(?!\s*$)/.test(t),f!==h-1&&(p="\n"===t.charAt(t.length-1),r=r||p),r&&(c.loose=!0),this.options.gfm&&(s=void 0,(i=/^\[[ xX]\] /.test(t))&&(s=" "!==t[1],t=t.replace(/^\[[ xX]\] +/,""))),c.items.push({type:"list_item",raw:l,task:i,checked:s,loose:r,text:t})}return c}},t.html=function(e){e=this.rules.block.html.exec(e);if(e)return{type:this.options.sanitize?"paragraph":"html",raw:e[0],pre:!this.options.sanitizer&&("pre"===e[1]||"script"===e[1]||"style"===e[1]),text:this.options.sanitize?this.options.sanitizer?this.options.sanitizer(e[0]):U(e[0]):e[0]}},t.def=function(e){e=this.rules.block.def.exec(e);if(e)return e[3]&&(e[3]=e[3].substring(1,e[3].length-1)),{tag:e[1].toLowerCase().replace(/\s+/g," "),raw:e[0],href:e[2],title:e[3]}},t.table=function(e){e=this.rules.block.table.exec(e);if(e){var t={type:"table",header:C(e[1].replace(/^ *| *\| *$/g,"")),align:e[2].replace(/^ *|\| *$/g,"").split(/ *\| */),cells:e[3]?e[3].replace(/\n$/,"").split("\n"):[]};if(t.header.length===t.align.length){t.raw=e[0];for(var n=t.align.length,r=0;r<n;r++)/^ *-+: *$/.test(t.align[r])?t.align[r]="right":/^ *:-+: *$/.test(t.align[r])?t.align[r]="center":/^ *:-+ *$/.test(t.align[r])?t.align[r]="left":t.align[r]=null;for(n=t.cells.length,r=0;r<n;r++)t.cells[r]=C(t.cells[r].replace(/^ *\| *| *\| *$/g,""),t.header.length);return t}}},t.lheading=function(e){e=this.rules.block.lheading.exec(e);if(e)return{type:"heading",raw:e[0],depth:"="===e[2].charAt(0)?1:2,text:e[1]}},t.paragraph=function(e){e=this.rules.block.paragraph.exec(e);if(e)return{type:"paragraph",raw:e[0],text:"\n"===e[1].charAt(e[1].length-1)?e[1].slice(0,-1):e[1]}},t.text=function(e,t){e=this.rules.block.text.exec(e);if(e){t=t[t.length-1];return 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start="'+t+'"':"")+">\n"+e+"</"+n+">\n"},u.listitem=function(e){return"<li>"+e+"</li>\n"},u.checkbox=function(e){return"<input "+(e?'checked="" ':"")+'disabled="" type="checkbox"'+(this.options.xhtml?" /":"")+"> "},u.paragraph=function(e){return"<p>"+e+"</p>\n"},u.table=function(e,u){return"<table>\n<thead>\n"+e+"</thead>\n"+(u=u&&"<tbody>"+u+"</tbody>")+"</table>\n"},u.tablerow=function(e){return"<tr>\n"+e+"</tr>\n"},u.tablecell=function(e,u){var t=u.header?"th":"td";return(u.align?"<"+t+' align="'+u.align+'">':"<"+t+">")+e+"</"+t+">\n"},u.strong=function(e){return"<strong>"+e+"</strong>"},u.em=function(e){return"<em>"+e+"</em>"},u.codespan=function(e){return"<code>"+e+"</code>"},u.br=function(){return this.options.xhtml?"<br/>":"<br>"},u.del=function(e){return"<del>"+e+"</del>"},u.link=function(e,u,t){if(null===(e=V(this.options.sanitize,this.options.baseUrl,e)))return t;e='<a href="'+H(e)+'"';return u&&(e+=' title="'+u+'"'),e+=">"+t+"</a>"},u.image=function(e,u,t){if(null===(e=V(this.options.sanitize,this.options.baseUrl,e)))return t;t='<img src="'+e+'" alt="'+t+'"';return u&&(t+=' title="'+u+'"'),t+=this.options.xhtml?"/>":">"},u.text=function(e){return e},e}(),K=function(){function e(){}var u=e.prototype;return u.strong=function(e){return e},u.em=function(e){return e},u.codespan=function(e){return e},u.del=function(e){return e},u.html=function(e){return e},u.text=function(e){return e},u.link=function(e,u,t){return""+t},u.image=function(e,u,t){return""+t},u.br=function(){return""},e}(),Q=function(){function e(){this.seen={}}var u=e.prototype;return u.serialize=function(e){return e.toLowerCase().trim().replace(/<[!\/a-z].*?>/gi,"").replace(/[\u2000-\u206F\u2E00-\u2E7F\\'!"#$%&()*+,./:;<=>?@[\]^`{|}~]/g,"").replace(/\s/g,"-")},u.getNextSafeSlug=function(e,u){var t=e,n=0;if(this.seen.hasOwnProperty(t))for(n=this.seen[e];t=e+"-"+ ++n,this.seen.hasOwnProperty(t););return u||(this.seen[e]=n,this.seen[t]=0),t},u.slug=function(e,u){void 0===u&&(u={});var t=this.serialize(e);return this.getNextSafeSlug(t,u.dryrun)},e}(),W=u.defaults,Y=b,ee=function(){function t(e){this.options=e||W,this.options.renderer=this.options.renderer||new J,this.renderer=this.options.renderer,this.renderer.options=this.options,this.textRenderer=new K,this.slugger=new Q}t.parse=function(e,u){return new t(u).parse(e)},t.parseInline=function(e,u){return new t(u).parseInline(e)};var e=t.prototype;return e.parse=function(e,u){void 0===u&&(u=!0);for(var t,n,r,i,s,l,a,D,o,c,h,p,g,f,F,A="",C=e.length,d=0;d<C;d++)switch((D=e[d]).type){case"space":continue;case"hr":A+=this.renderer.hr();continue;case"heading":A+=this.renderer.heading(this.parseInline(D.tokens),D.depth,Y(this.parseInline(D.tokens,this.textRenderer)),this.slugger);continue;case"code":A+=this.renderer.code(D.text,D.lang,D.escaped);continue;case"table":for(l=o="",r=D.header.length,t=0;t<r;t++)l+=this.renderer.tablecell(this.parseInline(D.tokens.header[t]),{header:!0,align:D.align[t]});for(o+=this.renderer.tablerow(l),a="",r=D.cells.length,t=0;t<r;t++){for(l="",i=(s=D.tokens.cells[t]).length,n=0;n<i;n++)l+=this.renderer.tablecell(this.parseInline(s[n]),{header:!1,align:D.align[n]});a+=this.renderer.tablerow(l)}A+=this.renderer.table(o,a);continue;case"blockquote":a=this.parse(D.tokens),A+=this.renderer.blockquote(a);continue;case"list":for(o=D.ordered,E=D.start,c=D.loose,r=D.items.length,a="",t=0;t<r;t++)g=(p=D.items[t]).checked,f=p.task,h="",p.task&&(F=this.renderer.checkbox(g),c?0<p.tokens.length&&"text"===p.tokens[0].type?(p.tokens[0].text=F+" "+p.tokens[0].text,p.tokens[0].tokens&&0<p.tokens[0].tokens.length&&"text"===p.tokens[0].tokens[0].type&&(p.tokens[0].tokens[0].text=F+" "+p.tokens[0].tokens[0].text)):p.tokens.unshift({type:"text",text:F}):h+=F),h+=this.parse(p.tokens,c),a+=this.renderer.listitem(h,f,g);A+=this.renderer.list(a,o,E);continue;case"html":A+=this.renderer.html(D.text);continue;case"paragraph":A+=this.renderer.paragraph(this.parseInline(D.tokens));continue;case"text":for(a=D.tokens?this.parseInline(D.tokens):D.text;d+1<C&&"text"===e[d+1].type;)a+="\n"+((D=e[++d]).tokens?this.parseInline(D.tokens):D.text);A+=u?this.renderer.paragraph(a):a;continue;default:var E='Token with "'+D.type+'" type was not found.';if(this.options.silent)return void console.error(E);throw new Error(E)}return A},e.parseInline=function(e,u){u=u||this.renderer;for(var t,n="",r=e.length,i=0;i<r;i++)switch((t=e[i]).type){case"escape":n+=u.text(t.text);break;case"html":n+=u.html(t.text);break;case"link":n+=u.link(t.href,t.title,this.parseInline(t.tokens,u));break;case"image":n+=u.image(t.href,t.title,t.text);break;case"strong":n+=u.strong(this.parseInline(t.tokens,u));break;case"em":n+=u.em(this.parseInline(t.tokens,u));break;case"codespan":n+=u.codespan(t.text);break;case"br":n+=u.br();break;case"del":n+=u.del(this.parseInline(t.tokens,u));break;case"text":n+=u.text(t.text);break;default:var s='Token with "'+t.type+'" type was not found.';if(this.options.silent)return void console.error(s);throw new Error(s)}return n},t}(),ue=v,te=z,ne=m,m=u.getDefaults,re=u.changeDefaults,u=u.defaults;function ie(e,t,n){if(null==e)throw new Error("marked(): input parameter is undefined or null");if("string"!=typeof e)throw new Error("marked(): input parameter is of type "+Object.prototype.toString.call(e)+", string expected");if("function"==typeof t&&(n=t,t=null),t=ue({},ie.defaults,t||{}),te(t),n){var r,i=t.highlight;try{r=X.lex(e,t)}catch(e){return n(e)}var s=function(u){var e;if(!u)try{e=ee.parse(r,t)}catch(e){u=e}return t.highlight=i,u?n(u):n(null,e)};if(!i||i.length<3)return s();if(delete t.highlight,!r.length)return s();var l=0;return ie.walkTokens(r,function(t){"code"===t.type&&(l++,setTimeout(function(){i(t.text,t.lang,function(e,u){return e?s(e):(null!=u&&u!==t.text&&(t.text=u,t.escaped=!0),void(0===--l&&s()))})},0))}),void(0===l&&s())}try{var u=X.lex(e,t);return t.walkTokens&&ie.walkTokens(u,t.walkTokens),ee.parse(u,t)}catch(e){if(e.message+="\nPlease report this to https://github.com/markedjs/marked.",t.silent)return"<p>An error occurred:</p><pre>"+ne(e.message+"",!0)+"</pre>";throw e}}return ie.options=ie.setOptions=function(e){return ue(ie.defaults,e),re(ie.defaults),ie},ie.getDefaults=m,ie.defaults=u,ie.use=function(l){var u,t=ue({},l);l.renderer&&function(){var e,s=ie.defaults.renderer||new J;for(e in l.renderer)!function(r){var i=s[r];s[r]=function(){for(var e=arguments.length,u=new Array(e),t=0;t<e;t++)u[t]=arguments[t];var n=l.renderer[r].apply(s,u);return n=!1===n?i.apply(s,u):n}}(e);t.renderer=s}(),l.tokenizer&&function(){var e,s=ie.defaults.tokenizer||new O;for(e in l.tokenizer)!function(r){var i=s[r];s[r]=function(){for(var e=arguments.length,u=new Array(e),t=0;t<e;t++)u[t]=arguments[t];var n=l.tokenizer[r].apply(s,u);return n=!1===n?i.apply(s,u):n}}(e);t.tokenizer=s}(),l.walkTokens&&(u=ie.defaults.walkTokens,t.walkTokens=function(e){l.walkTokens(e),u&&u(e)}),ie.setOptions(t)},ie.walkTokens=function(e,u){for(var t,n=c(e);!(t=n()).done;){var r=t.value;switch(u(r),r.type){case"table":for(var i=c(r.tokens.header);!(s=i()).done;){var s=s.value;ie.walkTokens(s,u)}for(var l,a=c(r.tokens.cells);!(l=a()).done;)for(var D=c(l.value);!(o=D()).done;){var o=o.value;ie.walkTokens(o,u)}break;case"list":ie.walkTokens(r.items,u);break;default:r.tokens&&ie.walkTokens(r.tokens,u)}}},ie.parseInline=function(e,u){if(null==e)throw new Error("marked.parseInline(): input parameter is undefined or null");if("string"!=typeof e)throw new Error("marked.parseInline(): input parameter is of type "+Object.prototype.toString.call(e)+", string expected");u=ue({},ie.defaults,u||{}),te(u);try{var t=X.lexInline(e,u);return u.walkTokens&&ie.walkTokens(t,u.walkTokens),ee.parseInline(t,u)}catch(e){if(e.message+="\nPlease report this to https://github.com/markedjs/marked.",u.silent)return"<p>An error occurred:</p><pre>"+ne(e.message+"",!0)+"</pre>";throw e}},ie.Parser=ee,ie.parser=ee.parse,ie.Renderer=J,ie.TextRenderer=K,ie.Lexer=X,ie.lexer=X.lex,ie.Tokenizer=O,ie.Slugger=Q,ie.parse=ie});
\ No newline at end of file
diff --git a/src/Lexer.js b/src/Lexer.js
index 111cc96304..6c02ed65e5 100644
--- a/src/Lexer.js
+++ b/src/Lexer.js
@@ -355,11 +355,17 @@ module.exports = class Lexer {
       maskedSrc = maskedSrc.slice(0, match.index) + '[' + repeatString('a', match[0].length - 2) + ']' + maskedSrc.slice(this.tokenizer.rules.inline.blockSkip.lastIndex);
     }
 
+    // Mask out escaped em & strong delimiters
+    while ((match = this.tokenizer.rules.inline.escapedEmSt.exec(maskedSrc)) != null) {
+      maskedSrc = maskedSrc.slice(0, match.index) + '++' + maskedSrc.slice(this.tokenizer.rules.inline.escapedEmSt.lastIndex);
+    }
+
     while (src) {
       if (!keepPrevChar) {
         prevChar = '';
       }
       keepPrevChar = false;
+
       // escape
       if (token = this.tokenizer.escape(src)) {
         src = src.substring(token.raw.length);
@@ -408,16 +414,8 @@ module.exports = class Lexer {
         continue;
       }
 
-      // strong
-      if (token = this.tokenizer.strong(src, maskedSrc, prevChar)) {
-        src = src.substring(token.raw.length);
-        token.tokens = this.inlineTokens(token.text, [], inLink, inRawBlock);
-        tokens.push(token);
-        continue;
-      }
-
-      // em
-      if (token = this.tokenizer.em(src, maskedSrc, prevChar)) {
+      // em & strong
+      if (token = this.tokenizer.emStrong(src, maskedSrc, prevChar)) {
         src = src.substring(token.raw.length);
         token.tokens = this.inlineTokens(token.text, [], inLink, inRawBlock);
         tokens.push(token);
@@ -463,7 +461,9 @@ module.exports = class Lexer {
       // text
       if (token = this.tokenizer.inlineText(src, inRawBlock, smartypants)) {
         src = src.substring(token.raw.length);
-        prevChar = token.raw.slice(-1);
+        if (token.raw.slice(-1) !== '_') { // Track prevChar before string of ____ started
+          prevChar = token.raw.slice(-1);
+        }
         keepPrevChar = true;
         lastToken = tokens[tokens.length - 1];
         if (lastToken && lastToken.type === 'text') {
diff --git a/src/Tokenizer.js b/src/Tokenizer.js
index 4b1eebf96d..13ef702b5d 100644
--- a/src/Tokenizer.js
+++ b/src/Tokenizer.js
@@ -527,46 +527,61 @@ module.exports = class Tokenizer {
     }
   }
 
-  strong(src, maskedSrc, prevChar = '') {
-    let match = this.rules.inline.strong.start.exec(src);
+  emStrong(src, maskedSrc, prevChar = '') {
+    let match = this.rules.inline.emStrong.lDelim.exec(src);
+    if (!match) return;
 
-    if (match && (!match[1] || (match[1] && (prevChar === '' || this.rules.inline.punctuation.exec(prevChar))))) {
-      maskedSrc = maskedSrc.slice(-1 * src.length);
-      const endReg = match[0] === '**' ? this.rules.inline.strong.endAst : this.rules.inline.strong.endUnd;
+    if (match[3] && prevChar.match(/[\p{L}\p{N}]/u)) return; // _ can't be between two alphanumerics. \p{L}\p{N} includes non-english alphabet/numbers as well
 
+    const nextChar = match[1] || match[2] || '';
+
+    if (!nextChar || (nextChar && (prevChar === '' || this.rules.inline.punctuation.exec(prevChar)))) {
+      const lLength = match[0].length - 1;
+      let rDelim, rLength, delimTotal = lLength, midDelimTotal = 0;
+
+      const endReg = match[0][0] === '*' ? this.rules.inline.emStrong.rDelimAst : this.rules.inline.emStrong.rDelimUnd;
       endReg.lastIndex = 0;
 
-      let cap;
+      maskedSrc = maskedSrc.slice(-1 * src.length + lLength); // Bump maskedSrc to same section of string as src (move to lexer?)
+
       while ((match = endReg.exec(maskedSrc)) != null) {
-        cap = this.rules.inline.strong.middle.exec(maskedSrc.slice(0, match.index + 3));
-        if (cap) {
-          return {
-            type: 'strong',
-            raw: src.slice(0, cap[0].length),
-            text: src.slice(2, cap[0].length - 2)
-          };
+        rDelim = match[1] || match[2] || match[3] || match[4] || match[5] || match[6];
+
+        if (!rDelim) continue; // matched the first alternative in rules.js (skip the * in __abc*abc__)
+
+        rLength = rDelim.length;
+
+        if (match[3] || match[4]) { // found another Left Delim
+          delimTotal += rLength;
+          continue;
+        } else if (match[5] || match[6]) { // either Left or Right Delim
+          if (lLength % 3 && !((lLength + rLength) % 3)) {
+            midDelimTotal += rLength;
+            continue; // CommonMark Emphasis Rules 9-10
+          }
         }
-      }
-    }
-  }
 
-  em(src, maskedSrc, prevChar = '') {
-    let match = this.rules.inline.em.start.exec(src);
+        delimTotal -= rLength;
 
-    if (match && (!match[1] || (match[1] && (prevChar === '' || this.rules.inline.punctuation.exec(prevChar))))) {
-      maskedSrc = maskedSrc.slice(-1 * src.length);
-      const endReg = match[0] === '*' ? this.rules.inline.em.endAst : this.rules.inline.em.endUnd;
+        if (delimTotal > 0) continue; // Haven't found enough closing delimiters
 
-      endReg.lastIndex = 0;
+        // If this is the last rDelimiter, remove extra characters. *a*** -> *a*
+        if (delimTotal + midDelimTotal - rLength <= 0 && !maskedSrc.slice(endReg.lastIndex).match(endReg)) {
+          rLength = Math.min(rLength, rLength + delimTotal + midDelimTotal);
+        }
 
-      let cap;
-      while ((match = endReg.exec(maskedSrc)) != null) {
-        cap = this.rules.inline.em.middle.exec(maskedSrc.slice(0, match.index + 2));
-        if (cap) {
+        if (Math.min(lLength, rLength) % 2) {
           return {
             type: 'em',
-            raw: src.slice(0, cap[0].length),
-            text: src.slice(1, cap[0].length - 1)
+            raw: src.slice(0, lLength + match.index + rLength + 1),
+            text: src.slice(1, lLength + match.index + rLength)
+          };
+        }
+        if (Math.min(lLength, rLength) % 2 === 0) {
+          return {
+            type: 'strong',
+            raw: src.slice(0, lLength + match.index + rLength + 1),
+            text: src.slice(2, lLength + match.index + rLength - 1)
           };
         }
       }
diff --git a/src/rules.js b/src/rules.js
index b7f245e714..1a39c3fc74 100644
--- a/src/rules.js
+++ b/src/rules.js
@@ -173,74 +173,41 @@ const inline = {
   reflink: /^!?\[(label)\]\[(?!\s*\])((?:\\[\[\]]?|[^\[\]\\])+)\]/,
   nolink: /^!?\[(?!\s*\])((?:\[[^\[\]]*\]|\\[\[\]]|[^\[\]])*)\](?:\[\])?/,
   reflinkSearch: 'reflink|nolink(?!\\()',
-  strong: {
-    start: /^(?:(\*\*(?=[*punctuation]))|\*\*)(?![\s])|__/, // (1) returns if starts w/ punctuation
-    middle: /^\*\*(?:(?:(?!overlapSkip)(?:[^*]|\\\*)|overlapSkip)|\*(?:(?!overlapSkip)(?:[^*]|\\\*)|overlapSkip)*?\*)+?\*\*$|^__(?![\s])((?:(?:(?!overlapSkip)(?:[^_]|\\_)|overlapSkip)|_(?:(?!overlapSkip)(?:[^_]|\\_)|overlapSkip)*?_)+?)__$/,
-    endAst: /[^punctuation\s]\*\*(?!\*)|[punctuation]\*\*(?!\*)(?:(?=[punctuation_\s]|$))/, // last char can't be punct, or final * must also be followed by punct (or endline)
-    endUnd: /[^\s]__(?!_)(?:(?=[punctuation*\s])|$)/ // last char can't be a space, and final _ must preceed punct or \s (or endline)
-  },
-  em: {
-    start: /^(?:(\*(?=[punctuation]))|\*)(?![*\s])|_/, // (1) returns if starts w/ punctuation
-    middle: /^\*(?:(?:(?!overlapSkip)(?:[^*]|\\\*)|overlapSkip)|\*(?:(?!overlapSkip)(?:[^*]|\\\*)|overlapSkip)*?\*)+?\*$|^_(?![_\s])(?:(?:(?!overlapSkip)(?:[^_]|\\_)|overlapSkip)|_(?:(?!overlapSkip)(?:[^_]|\\_)|overlapSkip)*?_)+?_$/,
-    endAst: /[^punctuation\s]\*(?!\*)|[punctuation]\*(?!\*)(?:(?=[punctuation_\s]|$))/, // last char can't be punct, or final * must also be followed by punct (or endline)
-    endUnd: /[^\s]_(?!_)(?:(?=[punctuation*\s])|$)/ // last char can't be a space, and final _ must preceed punct or \s (or endline)
+  emStrong: {
+    lDelim: /^(?:\*+(?:([punct_])|[^\s*]))|^_+(?:([punct*])|([^\s_]))/,
+    //        (1) and (2) can only be a Right Delimiter. (3) and (4) can only be Left.  (5) and (6) can be either Left or Right.
+    //        () Skip other delimiter (1) #***                (2) a***#, a***                   (3) #***a, ***a                 (4) ***#              (5) #***#                 (6) a***a
+    rDelimAst: /\_\_[^_]*?\*[^_]*?\_\_|[punct_](\*+)(?=[\s]|$)|[^punct*_\s](\*+)(?=[punct_\s]|$)|[punct_\s](\*+)(?=[^punct*_\s])|[\s](\*+)(?=[punct_])|[punct_](\*+)(?=[punct_])|[^punct*_\s](\*+)(?=[^punct*_\s])/,
+    rDelimUnd: /\*\*[^*]*?\_[^*]*?\*\*|[punct*](\_+)(?=[\s]|$)|[^punct*_\s](\_+)(?=[punct*\s]|$)|[punct*\s](\_+)(?=[^punct*_\s])|[\s](\_+)(?=[punct*])|[punct*](\_+)(?=[punct*])/ // ^- Not allowed for _
   },
   code: /^(`+)([^`]|[^`][\s\S]*?[^`])\1(?!`)/,
   br: /^( {2,}|\\)\n(?!\s*$)/,
   del: noopTest,
-  text: /^(`+|[^`])(?:(?= {2,}\n)|[\s\S]*?(?:(?=[\\<!\[`*]|\b_|$)|[^ ](?= {2,}\n)))/,
-  punctuation: /^([\s*punctuation])/
+  text: /^(`+|[^`])(?:(?= {2,}\n)|[\s\S]*?(?:(?=[\\<!\[`*_]|\b_|$)|[^ ](?= {2,}\n)))/,
+  punctuation: /^([\spunctuation])/
 };
 
-// list of punctuation marks from common mark spec
-// without * and _ to workaround cases with double emphasis
+// list of punctuation marks from CommonMark spec
+// without * and _ to handle the different emphasis markers * and _
 inline._punctuation = '!"#$%&\'()+\\-.,/:;<=>?@\\[\\]`^{|}~';
 inline.punctuation = edit(inline.punctuation).replace(/punctuation/g, inline._punctuation).getRegex();
 
 // sequences em should skip over [title](link), `code`, <html>
-inline._blockSkip = '\\[[^\\]]*?\\]\\([^\\)]*?\\)|`[^`]*?`|<[^>]*?>';
-inline._overlapSkip = '__[^_]*?__|\\*\\*\\[^\\*\\]*?\\*\\*';
+inline.blockSkip = /\[[^\]]*?\]\([^\)]*?\)|`[^`]*?`|<[^>]*?>/g;
+inline.escapedEmSt = /\\\*|\\_/g;
 
 inline._comment = edit(block._comment).replace('(?:-->|$)', '-->').getRegex();
 
-inline.em.start = edit(inline.em.start)
-  .replace(/punctuation/g, inline._punctuation)
-  .getRegex();
-
-inline.em.middle = edit(inline.em.middle)
-  .replace(/punctuation/g, inline._punctuation)
-  .replace(/overlapSkip/g, inline._overlapSkip)
-  .getRegex();
-
-inline.em.endAst = edit(inline.em.endAst, 'g')
-  .replace(/punctuation/g, inline._punctuation)
-  .getRegex();
-
-inline.em.endUnd = edit(inline.em.endUnd, 'g')
-  .replace(/punctuation/g, inline._punctuation)
-  .getRegex();
-
-inline.strong.start = edit(inline.strong.start)
-  .replace(/punctuation/g, inline._punctuation)
-  .getRegex();
-
-inline.strong.middle = edit(inline.strong.middle)
-  .replace(/punctuation/g, inline._punctuation)
-  .replace(/overlapSkip/g, inline._overlapSkip)
-  .getRegex();
-
-inline.strong.endAst = edit(inline.strong.endAst, 'g')
-  .replace(/punctuation/g, inline._punctuation)
-  .getRegex();
-
-inline.strong.endUnd = edit(inline.strong.endUnd, 'g')
-  .replace(/punctuation/g, inline._punctuation)
+inline.emStrong.lDelim = edit(inline.emStrong.lDelim)
+  .replace(/punct/g, inline._punctuation)
   .getRegex();
 
-inline.blockSkip = edit(inline._blockSkip, 'g')
+inline.emStrong.rDelimAst = edit(inline.emStrong.rDelimAst, 'g')
+  .replace(/punct/g, inline._punctuation)
   .getRegex();
 
-inline.overlapSkip = edit(inline._overlapSkip, 'g')
+inline.emStrong.rDelimUnd = edit(inline.emStrong.rDelimUnd, 'g')
+  .replace(/punct/g, inline._punctuation)
   .getRegex();
 
 inline._escapes = /\\([!"#$%&'()*+,\-./:;<=>?@\[\]\\^_`{|}~])/g;
@@ -319,7 +286,7 @@ inline.gfm = merge({}, inline.normal, {
   url: /^((?:ftp|https?):\/\/|www\.)(?:[a-zA-Z0-9\-]+\.?)+[^\s<]*|^email/,
   _backpedal: /(?:[^?!.,:;*_~()&]+|\([^)]*\)|&(?![a-zA-Z0-9]+;$)|[?!.,:;*_~)]+(?!$))+/,
   del: /^(~~?)(?=[^\s~])([\s\S]*?[^\s~])\1(?=[^~]|$)/,
-  text: /^([`~]+|[^`~])(?:(?= {2,}\n)|[\s\S]*?(?:(?=[\\<!\[`*~]|\b_|https?:\/\/|ftp:\/\/|www\.|$)|[^ ](?= {2,}\n)|[^a-zA-Z0-9.!#$%&'*+\/=?_`{\|}~-](?=[a-zA-Z0-9.!#$%&'*+\/=?_`{\|}~-]+@))|(?=[a-zA-Z0-9.!#$%&'*+\/=?_`{\|}~-]+@))/
+  text: /^([`~]+|[^`~])(?:(?= {2,}\n)|[\s\S]*?(?:(?=[\\<!\[`*~_]|\b_|https?:\/\/|ftp:\/\/|www\.|$)|[^ ](?= {2,}\n)|[^a-zA-Z0-9.!#$%&'*+\/=?_`{\|}~-](?=[a-zA-Z0-9.!#$%&'*+\/=?_`{\|}~-]+@))|(?=[a-zA-Z0-9.!#$%&'*+\/=?_`{\|}~-]+@))/
 });
 
 inline.gfm.url = edit(inline.gfm.url, 'i')
diff --git a/test/specs/bug/adjacent_lists.html b/test/specs/bug/adjacent_lists.html
new file mode 100644
index 0000000000..2d64bd5963
--- /dev/null
+++ b/test/specs/bug/adjacent_lists.html
@@ -0,0 +1 @@
+<p><em>foo <strong>bar *baz bim</strong> bam</em></p>
diff --git a/test/specs/bug/adjacent_lists.md b/test/specs/bug/adjacent_lists.md
new file mode 100644
index 0000000000..fdf80c0adb
--- /dev/null
+++ b/test/specs/bug/adjacent_lists.md
@@ -0,0 +1 @@
+*foo __bar *baz bim__ bam*
diff --git a/test/specs/commonmark/commonmark.0.29.json b/test/specs/commonmark/commonmark.0.29.json
index b40ee785c1..8399c10c35 100644
--- a/test/specs/commonmark/commonmark.0.29.json
+++ b/test/specs/commonmark/commonmark.0.29.json
@@ -2916,8 +2916,7 @@
     "example": 361,
     "start_line": 6390,
     "end_line": 6394,
-    "section": "Emphasis and strong emphasis",
-    "shouldFail": true
+    "section": "Emphasis and strong emphasis"
   },
   {
     "markdown": "aa_\"bb\"_cc\n",
@@ -3125,8 +3124,7 @@
     "example": 387,
     "start_line": 6641,
     "end_line": 6645,
-    "section": "Emphasis and strong emphasis",
-    "shouldFail": true
+    "section": "Emphasis and strong emphasis"
   },
   {
     "markdown": "__foo, __bar__, baz__\n",
@@ -3134,8 +3132,7 @@
     "example": 388,
     "start_line": 6648,
     "end_line": 6652,
-    "section": "Emphasis and strong emphasis",
-    "shouldFail": true
+    "section": "Emphasis and strong emphasis"
   },
   {
     "markdown": "foo-__(bar)__\n",
@@ -3287,8 +3284,7 @@
     "example": 407,
     "start_line": 6831,
     "end_line": 6835,
-    "section": "Emphasis and strong emphasis",
-    "shouldFail": true
+    "section": "Emphasis and strong emphasis"
   },
   {
     "markdown": "*foo *bar**\n",
@@ -3328,8 +3324,7 @@
     "example": 412,
     "start_line": 6888,
     "end_line": 6892,
-    "section": "Emphasis and strong emphasis",
-    "shouldFail": true
+    "section": "Emphasis and strong emphasis"
   },
   {
     "markdown": "*foo **bar***\n",
@@ -3353,8 +3348,7 @@
     "example": 415,
     "start_line": 6913,
     "end_line": 6917,
-    "section": "Emphasis and strong emphasis",
-    "shouldFail": true
+    "section": "Emphasis and strong emphasis"
   },
   {
     "markdown": "foo******bar*********baz\n",
@@ -3362,8 +3356,7 @@
     "example": 416,
     "start_line": 6919,
     "end_line": 6923,
-    "section": "Emphasis and strong emphasis",
-    "shouldFail": true
+    "section": "Emphasis and strong emphasis"
   },
   {
     "markdown": "*foo **bar *baz* bim** bop*\n",
@@ -3427,8 +3420,7 @@
     "example": 424,
     "start_line": 6990,
     "end_line": 6994,
-    "section": "Emphasis and strong emphasis",
-    "shouldFail": true
+    "section": "Emphasis and strong emphasis"
   },
   {
     "markdown": "____foo__ bar__\n",
@@ -3436,8 +3428,7 @@
     "example": 425,
     "start_line": 6997,
     "end_line": 7001,
-    "section": "Emphasis and strong emphasis",
-    "shouldFail": true
+    "section": "Emphasis and strong emphasis"
   },
   {
     "markdown": "**foo **bar****\n",
@@ -3573,8 +3564,7 @@
     "example": 442,
     "start_line": 7129,
     "end_line": 7133,
-    "section": "Emphasis and strong emphasis",
-    "shouldFail": true
+    "section": "Emphasis and strong emphasis"
   },
   {
     "markdown": "***foo**\n",
@@ -3598,8 +3588,7 @@
     "example": 445,
     "start_line": 7150,
     "end_line": 7154,
-    "section": "Emphasis and strong emphasis",
-    "shouldFail": true
+    "section": "Emphasis and strong emphasis"
   },
   {
     "markdown": "*foo****\n",
@@ -3607,8 +3596,7 @@
     "example": 446,
     "start_line": 7157,
     "end_line": 7161,
-    "section": "Emphasis and strong emphasis",
-    "shouldFail": true
+    "section": "Emphasis and strong emphasis"
   },
   {
     "markdown": "foo ___\n",
@@ -3664,8 +3652,7 @@
     "example": 453,
     "start_line": 7209,
     "end_line": 7213,
-    "section": "Emphasis and strong emphasis",
-    "shouldFail": true
+    "section": "Emphasis and strong emphasis"
   },
   {
     "markdown": "_foo__\n",
@@ -3673,8 +3660,7 @@
     "example": 454,
     "start_line": 7220,
     "end_line": 7224,
-    "section": "Emphasis and strong emphasis",
-    "shouldFail": true
+    "section": "Emphasis and strong emphasis"
   },
   {
     "markdown": "___foo__\n",
@@ -3682,8 +3668,7 @@
     "example": 455,
     "start_line": 7227,
     "end_line": 7231,
-    "section": "Emphasis and strong emphasis",
-    "shouldFail": true
+    "section": "Emphasis and strong emphasis"
   },
   {
     "markdown": "____foo_\n",
@@ -3691,8 +3676,7 @@
     "example": 456,
     "start_line": 7234,
     "end_line": 7238,
-    "section": "Emphasis and strong emphasis",
-    "shouldFail": true
+    "section": "Emphasis and strong emphasis"
   },
   {
     "markdown": "__foo___\n",
@@ -3700,8 +3684,7 @@
     "example": 457,
     "start_line": 7241,
     "end_line": 7245,
-    "section": "Emphasis and strong emphasis",
-    "shouldFail": true
+    "section": "Emphasis and strong emphasis"
   },
   {
     "markdown": "_foo____\n",
@@ -3709,8 +3692,7 @@
     "example": 458,
     "start_line": 7248,
     "end_line": 7252,
-    "section": "Emphasis and strong emphasis",
-    "shouldFail": true
+    "section": "Emphasis and strong emphasis"
   },
   {
     "markdown": "**foo**\n",
@@ -3766,8 +3748,7 @@
     "example": 465,
     "start_line": 7307,
     "end_line": 7311,
-    "section": "Emphasis and strong emphasis",
-    "shouldFail": true
+    "section": "Emphasis and strong emphasis"
   },
   {
     "markdown": "***foo***\n",
@@ -3775,8 +3756,7 @@
     "example": 466,
     "start_line": 7316,
     "end_line": 7320,
-    "section": "Emphasis and strong emphasis",
-    "shouldFail": true
+    "section": "Emphasis and strong emphasis"
   },
   {
     "markdown": "_____foo_____\n",
@@ -3784,8 +3764,7 @@
     "example": 467,
     "start_line": 7323,
     "end_line": 7327,
-    "section": "Emphasis and strong emphasis",
-    "shouldFail": true
+    "section": "Emphasis and strong emphasis"
   },
   {
     "markdown": "*foo _bar* baz_\n",
@@ -3809,8 +3788,7 @@
     "example": 470,
     "start_line": 7348,
     "end_line": 7352,
-    "section": "Emphasis and strong emphasis",
-    "shouldFail": true
+    "section": "Emphasis and strong emphasis"
   },
   {
     "markdown": "*foo *bar baz*\n",
diff --git a/test/specs/gfm/commonmark.0.29.json b/test/specs/gfm/commonmark.0.29.json
index 5c4eba25bd..36394f5277 100644
--- a/test/specs/gfm/commonmark.0.29.json
+++ b/test/specs/gfm/commonmark.0.29.json
@@ -2916,8 +2916,7 @@
     "example": 361,
     "start_line": 6390,
     "end_line": 6394,
-    "section": "Emphasis and strong emphasis",
-    "shouldFail": true
+    "section": "Emphasis and strong emphasis"
   },
   {
     "markdown": "aa_\"bb\"_cc\n",
@@ -3125,8 +3124,7 @@
     "example": 387,
     "start_line": 6641,
     "end_line": 6645,
-    "section": "Emphasis and strong emphasis",
-    "shouldFail": true
+    "section": "Emphasis and strong emphasis"
   },
   {
     "markdown": "__foo, __bar__, baz__\n",
@@ -3134,8 +3132,7 @@
     "example": 388,
     "start_line": 6648,
     "end_line": 6652,
-    "section": "Emphasis and strong emphasis",
-    "shouldFail": true
+    "section": "Emphasis and strong emphasis"
   },
   {
     "markdown": "foo-__(bar)__\n",
@@ -3287,8 +3284,7 @@
     "example": 407,
     "start_line": 6831,
     "end_line": 6835,
-    "section": "Emphasis and strong emphasis",
-    "shouldFail": true
+    "section": "Emphasis and strong emphasis"
   },
   {
     "markdown": "*foo *bar**\n",
@@ -3328,8 +3324,7 @@
     "example": 412,
     "start_line": 6888,
     "end_line": 6892,
-    "section": "Emphasis and strong emphasis",
-    "shouldFail": true
+    "section": "Emphasis and strong emphasis"
   },
   {
     "markdown": "*foo **bar***\n",
@@ -3353,8 +3348,7 @@
     "example": 415,
     "start_line": 6913,
     "end_line": 6917,
-    "section": "Emphasis and strong emphasis",
-    "shouldFail": true
+    "section": "Emphasis and strong emphasis"
   },
   {
     "markdown": "foo******bar*********baz\n",
@@ -3362,8 +3356,7 @@
     "example": 416,
     "start_line": 6919,
     "end_line": 6923,
-    "section": "Emphasis and strong emphasis",
-    "shouldFail": true
+    "section": "Emphasis and strong emphasis"
   },
   {
     "markdown": "*foo **bar *baz* bim** bop*\n",
@@ -3427,8 +3420,7 @@
     "example": 424,
     "start_line": 6990,
     "end_line": 6994,
-    "section": "Emphasis and strong emphasis",
-    "shouldFail": true
+    "section": "Emphasis and strong emphasis"
   },
   {
     "markdown": "____foo__ bar__\n",
@@ -3436,8 +3428,7 @@
     "example": 425,
     "start_line": 6997,
     "end_line": 7001,
-    "section": "Emphasis and strong emphasis",
-    "shouldFail": true
+    "section": "Emphasis and strong emphasis"
   },
   {
     "markdown": "**foo **bar****\n",
@@ -3573,8 +3564,7 @@
     "example": 442,
     "start_line": 7129,
     "end_line": 7133,
-    "section": "Emphasis and strong emphasis",
-    "shouldFail": true
+    "section": "Emphasis and strong emphasis"
   },
   {
     "markdown": "***foo**\n",
@@ -3598,8 +3588,7 @@
     "example": 445,
     "start_line": 7150,
     "end_line": 7154,
-    "section": "Emphasis and strong emphasis",
-    "shouldFail": true
+    "section": "Emphasis and strong emphasis"
   },
   {
     "markdown": "*foo****\n",
@@ -3607,8 +3596,7 @@
     "example": 446,
     "start_line": 7157,
     "end_line": 7161,
-    "section": "Emphasis and strong emphasis",
-    "shouldFail": true
+    "section": "Emphasis and strong emphasis"
   },
   {
     "markdown": "foo ___\n",
@@ -3664,8 +3652,7 @@
     "example": 453,
     "start_line": 7209,
     "end_line": 7213,
-    "section": "Emphasis and strong emphasis",
-    "shouldFail": true
+    "section": "Emphasis and strong emphasis"
   },
   {
     "markdown": "_foo__\n",
@@ -3673,8 +3660,7 @@
     "example": 454,
     "start_line": 7220,
     "end_line": 7224,
-    "section": "Emphasis and strong emphasis",
-    "shouldFail": true
+    "section": "Emphasis and strong emphasis"
   },
   {
     "markdown": "___foo__\n",
@@ -3682,8 +3668,7 @@
     "example": 455,
     "start_line": 7227,
     "end_line": 7231,
-    "section": "Emphasis and strong emphasis",
-    "shouldFail": true
+    "section": "Emphasis and strong emphasis"
   },
   {
     "markdown": "____foo_\n",
@@ -3691,8 +3676,7 @@
     "example": 456,
     "start_line": 7234,
     "end_line": 7238,
-    "section": "Emphasis and strong emphasis",
-    "shouldFail": true
+    "section": "Emphasis and strong emphasis"
   },
   {
     "markdown": "__foo___\n",
@@ -3700,8 +3684,7 @@
     "example": 457,
     "start_line": 7241,
     "end_line": 7245,
-    "section": "Emphasis and strong emphasis",
-    "shouldFail": true
+    "section": "Emphasis and strong emphasis"
   },
   {
     "markdown": "_foo____\n",
@@ -3709,8 +3692,7 @@
     "example": 458,
     "start_line": 7248,
     "end_line": 7252,
-    "section": "Emphasis and strong emphasis",
-    "shouldFail": true
+    "section": "Emphasis and strong emphasis"
   },
   {
     "markdown": "**foo**\n",
@@ -3766,8 +3748,7 @@
     "example": 465,
     "start_line": 7307,
     "end_line": 7311,
-    "section": "Emphasis and strong emphasis",
-    "shouldFail": true
+    "section": "Emphasis and strong emphasis"
   },
   {
     "markdown": "***foo***\n",
@@ -3775,8 +3756,7 @@
     "example": 466,
     "start_line": 7316,
     "end_line": 7320,
-    "section": "Emphasis and strong emphasis",
-    "shouldFail": true
+    "section": "Emphasis and strong emphasis"
   },
   {
     "markdown": "_____foo_____\n",
@@ -3784,8 +3764,7 @@
     "example": 467,
     "start_line": 7323,
     "end_line": 7327,
-    "section": "Emphasis and strong emphasis",
-    "shouldFail": true
+    "section": "Emphasis and strong emphasis"
   },
   {
     "markdown": "*foo _bar* baz_\n",
@@ -3809,8 +3788,7 @@
     "example": 470,
     "start_line": 7348,
     "end_line": 7352,
-    "section": "Emphasis and strong emphasis",
-    "shouldFail": true
+    "section": "Emphasis and strong emphasis"
   },
   {
     "markdown": "*foo *bar baz*\n",
diff --git a/test/specs/new/em_list_links.html b/test/specs/new/em_list_links.html
index b52cd2a926..84b18fb7f3 100644
--- a/test/specs/new/em_list_links.html
+++ b/test/specs/new/em_list_links.html
@@ -14,10 +14,10 @@
 </ul>
 </li>
 <li>bold italic<ul>
-<li><a href="https://www.google.com"><strong><em>named link</em></strong></a></li>
-<li><strong><em><a href="https://www.google.com">named link</a></em></strong></li>
-<li><a href="https://www.google.com"><strong><em>named link</em></strong></a></li>
-<li><strong><em><a href="https://www.google.com">named link</a></em></strong></li>
+<li><a href="https://www.google.com"><em><strong>named link</strong></em></a></li>
+<li><em><strong><a href="https://www.google.com">named link</a></strong></em></li>
+<li><a href="https://www.google.com"><em><strong>named link</strong></em></a></li>
+<li><em><strong><a href="https://www.google.com">named link</a></strong></em></li>
 <li><a href="https://www.google.com"><em><strong>named link</strong></em></a></li>
 <li><a href="https://www.google.com"><strong><em>named link</em></strong></a></li>
 <li><strong><em><a href="https://www.google.com">named link</a></em></strong></li>
@@ -42,14 +42,13 @@
 </ul>
 </li>
 <li>code bold italic<ul>
-<li><a href="https://www.google.com"><strong><em><code>named link</code></em></strong></a></li>
-<li><strong><em><a href="https://www.google.com"><code>named link</code></a></em></strong></li>
-<li><a href="https://www.google.com"><strong><em><code>named link</code></em></strong></a></li>
-<li><strong><em><a href="https://www.google.com"><code>named link</code></a></em></strong></li>
+<li><a href="https://www.google.com"><em><strong><code>named link</code></strong></em></a></li>
+<li><em><strong><a href="https://www.google.com"><code>named link</code></a></strong></em></li>
+<li><a href="https://www.google.com"><em><strong><code>named link</code></strong></em></a></li>
+<li><em><strong><a href="https://www.google.com"><code>named link</code></a></strong></em></li>
 <li><a href="https://www.google.com"><em><strong><code>named link</code></strong></em></a></li>
 <li><a href="https://www.google.com"><strong><em><code>named link</code></em></strong></a></li>
 <li><strong><em><a href="https://www.google.com"><code>named link</code></a></em></strong></li>
 </ul>
 </li>
 </ul>
-
diff --git a/test/specs/original/strong_and_em_together.html b/test/specs/original/strong_and_em_together.html
deleted file mode 100644
index 71ec78c709..0000000000
--- a/test/specs/original/strong_and_em_together.html
+++ /dev/null
@@ -1,7 +0,0 @@
-<p><strong><em>This is strong and em.</em></strong></p>
-
-<p>So is <strong><em>this</em></strong> word.</p>
-
-<p><strong><em>This is strong and em.</em></strong></p>
-
-<p>So is <strong><em>this</em></strong> word.</p>
diff --git a/test/specs/original/strong_and_em_together.md b/test/specs/original/strong_and_em_together.md
deleted file mode 100644
index 95ee690dbe..0000000000
--- a/test/specs/original/strong_and_em_together.md
+++ /dev/null
@@ -1,7 +0,0 @@
-***This is strong and em.***
-
-So is ***this*** word.
-
-___This is strong and em.___
-
-So is ___this___ word.
diff --git a/test/specs/redos/quadratic_underscores.js b/test/specs/redos/quadratic_underscores.js
new file mode 100644
index 0000000000..a695488e09
--- /dev/null
+++ b/test/specs/redos/quadratic_underscores.js
@@ -0,0 +1,4 @@
+module.exports = {
+  markdown: `${'_'.repeat(101)} a`,
+  html: `<p>${'_'.repeat(101)} a</p>`
+};

From 9d3a7818c4d00b320d6f842710e3cfe4cdcb4f8e Mon Sep 17 00:00:00 2001
From: MarkedJS bot <>
Date: Sun, 7 Feb 2021 22:26:15 +0000
Subject: [PATCH 3/4] =?UTF-8?q?=F0=9F=97=9C=EF=B8=8F=20build=20[skip=20ci]?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 lib/marked.esm.js | 4 ++--
 marked.min.js     | 2 +-
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/lib/marked.esm.js b/lib/marked.esm.js
index d40c19a59d..2a1c83b8f6 100644
--- a/lib/marked.esm.js
+++ b/lib/marked.esm.js
@@ -1709,7 +1709,7 @@ var Lexer_1 = class Lexer {
         src = src.substring(token.raw.length);
         inLink = token.inLink;
         inRawBlock = token.inRawBlock;
-        lastToken = tokens[tokens.length - 1];
+        const lastToken = tokens[tokens.length - 1];
         if (lastToken && token.type === 'text' && lastToken.type === 'text') {
           lastToken.raw += token.raw;
           lastToken.text += token.text;
@@ -1732,7 +1732,7 @@ var Lexer_1 = class Lexer {
       // reflink, nolink
       if (token = this.tokenizer.reflink(src, this.tokens.links)) {
         src = src.substring(token.raw.length);
-        lastToken = tokens[tokens.length - 1];
+        const lastToken = tokens[tokens.length - 1];
         if (token.type === 'link') {
           token.tokens = this.inlineTokens(token.text, [], true, inRawBlock);
           tokens.push(token);
diff --git a/marked.min.js b/marked.min.js
index 46bf2d712e..383adb028e 100644
--- a/marked.min.js
+++ b/marked.min.js
@@ -3,4 +3,4 @@
  * Copyright (c) 2011-2021, Christopher Jeffrey. (MIT Licensed)
  * https://github.com/markedjs/marked
  */
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\ No newline at end of file

From 8a7502f54fcc236027ae38e5432c4caf30accf23 Mon Sep 17 00:00:00 2001
From: semantic-release-bot <semantic-release-bot@martynus.net>
Date: Sun, 7 Feb 2021 22:26:26 +0000
Subject: [PATCH 4/4] chore(release): 2.0.0 [skip ci]

# [2.0.0](https://github.com/markedjs/marked/compare/v1.2.9...v2.0.0) (2021-02-07)

### Bug Fixes

* Join adjacent inlineText tokens ([#1926](https://github.com/markedjs/marked/issues/1926)) ([f848e77](https://github.com/markedjs/marked/commit/f848e7703956a6c37871432a7e128f51b1700aa0))
* Total rework of Emphasis/Strong ([#1864](https://github.com/markedjs/marked/issues/1864)) ([7293251](https://github.com/markedjs/marked/commit/7293251c438e3ee968970f7609f1a27f9007bccd))

### BREAKING CHANGES

* `em` and `strong` tokenizers have been merged into one `emStrong` tokenizer
---
 package-lock.json | 2 +-
 package.json      | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/package-lock.json b/package-lock.json
index 318cc163e4..e11825bf5b 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "marked",
-  "version": "1.2.9",
+  "version": "2.0.0",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
diff --git a/package.json b/package.json
index c1610ffb1e..19dc30622a 100644
--- a/package.json
+++ b/package.json
@@ -2,7 +2,7 @@
   "name": "marked",
   "description": "A markdown parser built for speed",
   "author": "Christopher Jeffrey",
-  "version": "1.2.9",
+  "version": "2.0.0",
   "main": "./src/marked.js",
   "browser": "./lib/marked.js",
   "bin": {