Ticket #33106: 33106-idea.patch

src/wp-includes/formatting.php

@@ -614 +614 @@
                 . ')*+'         // Loop possessively.
                 . '(?:-->)?';   // End of comment. If not found, match all input.
 
+        $cdata =
+                  '!\[CDATA\['  // Start of comment, after the <.
+                . '(?:'         // Unroll the loop: Consume everything until ]]> is found.
+                .     '](?!]>)' // One ] not followed by end of comment.
+                .     '[^\]]*+' // Consume non-].
+                . ')*+'         // Loop possessively.
+                . '(?:]]>)?';   // End of comment. If not found, match all input.
+
         $regex =
                   '/('              // Capture the entire match.
                 .     '<'           // Find start of element.
@@ -620 +628 @@
                 .     '(?(?=!--)'   // Is this a comment?
                 .         $comments // Find end of comment.
                 .     '|'
-                .         '[^>]*>?' // Find end of element. If not found, match all input.
+                .         '(?(?=!\[CDATA\[)' // Is this a comment?
+                .             $cdata // Find end of comment.
+                .         '|'
+                .             '[^>]*>?' // Find end of element. If not found, match all input.
+                .         ')'
                 .     ')'
                 . ')/s';