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Eliminate backtracking in the interpreter for patterns with .* #51508

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Merged
17 commits merged into from
Jul 18, 2021
Merged

Eliminate backtracking in the interpreter for patterns with .* #51508

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2511bfa
First cut of look up table for speeding up Go()
Apr 13, 2021
781541c
More efficient .* in RegexInterpreter
Apr 13, 2021
1c7faa0
sq
Apr 19, 2021
7ea6425
Get more debug info
Apr 20, 2021
9c234d4
Remove assert and add unit test
Apr 26, 2021
85b6897
Potential unit test
May 26, 2021
7a404e9
temp
Jun 21, 2021
1949445
Fix a bug
Jun 22, 2021
1564d7a
sq
Jun 22, 2021
7f76e5f
Add extra protection to the backtracking optimization
Jun 22, 2021
ac838ad
Add unit test
Jun 22, 2021
262d5d5
Revert
Jun 30, 2021
aacb00e
RegexCompiler changes
Apr 23, 2021
4f6bdd4
sq
Jul 14, 2021
d8e73cc
Remove debug unit tests
Jul 14, 2021
cb3f3f2
Add a length to the AsSpan call
Jul 14, 2021
3ba7f45
Address RegexCompiler comments and add unit tests
Jul 16, 2021
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Fix a bug
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Prashanth Govindarajan committed Jun 30, 2021
commit 19494455423e94809b5073cba7c824082c3bbbed
2 changes: 1 addition & 1 deletion ...ies/System.Text.RegularExpressions/src/System/Text/RegularExpressions/RegexInterpreter.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -225,7 +225,7 @@ private bool MatchString(string str)
if (runtextend - runtextpos < c)
{
// If MatchString was called after a greedy op such as a .*, we would have zipped runtextpos to the end without really examining any characters. Reset to maxBacktrackPos here as an optimization
if (_maxBacktrackPosition != -1 && runtextpos > _maxBacktrackPosition)
if (!_caseInsensitive && _maxBacktrackPosition != -1 && runtextpos > _maxBacktrackPosition)
{
// If lastIndexOf is -1, we backtrack to the max extent possible.
runtextpos = _maxBacktrackPosition;
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