Accept lowercase inline HTML declarations

thephpleague · Jul 22, 2024 · a0cd1cd · a0cd1cd
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diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -21,6 +21,7 @@ Updates should follow the [Keep a CHANGELOG](https://keepachangelog.com/) princi
 
 - Fixed list tightness not being determined properly in some edge cases
 - Fixed incorrect ending line numbers for several block types in various scenarios
+- Fixed lowercase inline HTML declarations not being accepted
 
 ## [2.4.4] - 2024-07-22
 

diff --git a/src/Util/RegexHelper.php b/src/Util/RegexHelper.php
@@ -55,7 +55,7 @@ final class RegexHelper
     public const PARTIAL_CLOSEBLOCKTAG         = '<\/' . self::PARTIAL_BLOCKTAGNAME . '\s*[>]';
     public const PARTIAL_HTMLCOMMENT           = '<!-->|<!--->|<!--[\s\S]*?-->';
     public const PARTIAL_PROCESSINGINSTRUCTION = '[<][?][\s\S]*?[?][>]';
-    public const PARTIAL_DECLARATION           = '<![A-Z]+' . '[^>]*>';
+    public const PARTIAL_DECLARATION           = '<![A-Za-z]+' . '[^>]*>';
     public const PARTIAL_CDATA                 = '<!\[CDATA\[[\s\S]*?]\]>';
     public const PARTIAL_HTMLTAG               = '(?:' . self::PARTIAL_OPENTAG . '|' . self::PARTIAL_CLOSETAG . '|' . self::PARTIAL_HTMLCOMMENT . '|' .
         self::PARTIAL_PROCESSINGINSTRUCTION . '|' . self::PARTIAL_DECLARATION . '|' . self::PARTIAL_CDATA . ')';