wp-class regexp bug

I have found php bug in wp-includes/wp-class.php file

201&202 line is about:
preg_match(“#^$match#”, $request_match, $matches)

that’s wrong use of preg_match – it can produce invalid regexp compilation if URL ($match variable) contains # char.

Correct usage should be
preg_match(“#^”.str_replace(“#”,”\#”,$match).”#” ….

if you use starting and ending symbols you must be sure that it’s not containing in target expression