Add a filter to ignore messages that match a regex

src/GitVersionCore/Configuration/IgnoreConfig.cs

@@ -1,4 +1,4 @@
-namespace GitVersion
+namespace GitVersion
 {
     using System;
     using System.Collections.Generic;
@@ -19,10 +19,14 @@ public IgnoreConfig()
         [YamlMember(Alias = "sha")]
         public IEnumerable<string> SHAs { get; set; }
 
+        [YamlMember(Alias = "regex")]
+        public string Regex { get; set; }
+
         public virtual IEnumerable<IVersionFilter> ToFilters()
         {
             if (SHAs.Any()) yield return new ShaVersionFilter(SHAs);
             if (Before.HasValue) yield return new MinDateVersionFilter(Before.Value);
+            if (!string.IsNullOrWhiteSpace(Regex)) yield return new MessageFilter(Regex);
         }
     }
-}
+}

src/GitVersionCore/VersionFilters/MessageFilter.cs

@@ -0,0 +1,35 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+using System.Text.RegularExpressions;
+using GitVersion.VersionCalculation.BaseVersionCalculators;
+
+namespace GitVersion.VersionFilters
+{
+    public class MessageFilter : IVersionFilter
+    {
+        private readonly Regex regex;
+
+        public MessageFilter(string regex)
+        {
+            if (regex == null) throw new ArgumentNullException(nameof(regex));
+            this.regex = new Regex(regex); ;
+        }
+
+        public bool Exclude(BaseVersion version, out string reason)
+        {
+            if (version == null) throw new ArgumentNullException(nameof(version));
+
+            reason = null;
+
+            if (version.BaseVersionSource != null &&
+                regex.Match(version.BaseVersionSource.Message).Success)
+            {
+                reason = $"Message {version.BaseVersionSource.Message} was ignored due to commit having been excluded by configuration";
+                return true;
+            }
+
+            return false;
+        }
+    }
+}