- $regex = '/(' // Capture the entire match.
- . '<' // Find start of element.
- . '(?(?=!--)' // Is this a comment?
- . '.+?--\s*>' // Find end of comment
- . '|'
- . '[^>]+>' // Find end of element
- . ')'
+ $tagnames = array_keys( $shortcode_tags );
+ $tagregexp = join( '|', array_map( 'preg_quote', $tagnames ) );
+ $tagregexp = "(?:$tagregexp)(?![\\w-])"; // Excerpt of get_shortcode_regex().
+
+ $comment_regex =
+ '!' // Start of comment, after the <.
+ . '(?:' // Unroll the loop: Consume everything until --> is found.
+ . '-(?!->)' // Dash not followed by end of comment.
+ . '[^\-]*+' // Consume non-dashes.
+ . ')*+' // Loop possessively.
+ . '(?:-->)?'; // End of comment. If not found, match all input.
+
+ $shortcode_regex =
+ '\[' // Find start of shortcode.
+ . '[\/\[]?' // Shortcodes may begin with [/ or [[
+ . $tagregexp // Only match registered shortcodes, because performance.
+ . '(?:'
+ . '[^\[\]<>]+' // Shortcodes do not contain other shortcodes. Quantifier critical.