Update the regex for matching single-quote and double-quote strings for PowerShell and Bash (#357)

Author: daxian-dbw

shell/Markdown.VT/ColorCode.VT/Parser/Bash.cs

@@ -24,6 +24,20 @@ public class Bash : ILanguage
                     {1, BashCommentScope}
                 }),
 
+            new LanguageRule(
+                @"'[^\n]*?'",
+                new Dictionary<int, string>
+                {
+                    {0, ScopeName.String}
+                }),
+
+            new LanguageRule(
+                @"""[^\n]*?(?<!\\)""",
+                new Dictionary<int, string>
+                {
+                    {0, ScopeName.String}
+                }),
+
             // match the first word of a line in a multi-line string as the command name.
             new LanguageRule(
                 @"(?m)^\s*(\w+)",

shell/Markdown.VT/ColorCode.VT/Parser/PowerShell.cs

@@ -48,7 +48,7 @@ public IList<LanguageRule> Rules
                             }),
 
                     new LanguageRule(
-                        @"'[^\n]*?(?<!\\)'",
+                        @"'[^\n]*?'",
                         new Dictionary<int, string>
                             {
                                 {0, ScopeName.String}
@@ -62,7 +62,7 @@ public IList<LanguageRule> Rules
                             }),
 
                     new LanguageRule(
-                        @"(?s)(""[^\n]*?(?<!`)"")",
+                        @"""[^\n]*?(?<!`)""",
                         new Dictionary<int, string>
                             {
                                 {0, ScopeName.String}