Optimize PARTIAL_HTMLCOMMENT with better grouping

Author: colinodell

src/Util/RegexHelper.php

@@ -53,7 +53,7 @@ final class RegexHelper
     public const PARTIAL_CLOSETAG              = '<\/' . self::PARTIAL_TAGNAME . '\s*[>]';
     public const PARTIAL_OPENBLOCKTAG          = '<' . self::PARTIAL_BLOCKTAGNAME . self::PARTIAL_ATTRIBUTE . '*' . '\s*\/?>';
     public const PARTIAL_CLOSEBLOCKTAG         = '<\/' . self::PARTIAL_BLOCKTAGNAME . '\s*[>]';
-    public const PARTIAL_HTMLCOMMENT           = '<!-->|<!--->|<!--[\s\S]*?-->';
+    public const PARTIAL_HTMLCOMMENT           = '(?:<!-->|<!--->|<!--[\s\S]*?-->)';
     public const PARTIAL_PROCESSINGINSTRUCTION = '[<][?][\s\S]*?[?][>]';
     public const PARTIAL_DECLARATION           = '<![A-Za-z]+' . '[^>]*>';
     public const PARTIAL_CDATA                 = '<!\[CDATA\[[\s\S]*?]\]>';