+ $urlRev = strrev( $url );
+ $numSepChars = strspn( $urlRev, $sep );
+ # Don't break a trailing HTML entity by moving the ; into $trail
+ # This is in hot code, so use substr_compare to avoid having to
+ # create a new string object for the comparison
+ if ( $numSepChars && substr_compare( $url, ";", -$numSepChars, 1 ) === 0) {
+ # more optimization: instead of running preg_match with a $
+ # anchor, which can be slow, do the match on the reversed
+ # string starting at the desired offset.
+ # un-reversed regexp is: /&([a-z]+|#x[\da-f]+|#\d+)$/i
+ if ( preg_match( '/\G([a-z]+|[\da-f]+x#|\d+#)&/i', $urlRev, $m2, 0, $numSepChars ) ) {
+ $numSepChars--;
+ }
+ }