Ticket #5668: allow-parens-in-url.diff

wp-includes/formatting.php

@@ -1111 +1111 @@
         $original_url = $url;
 
         if ('' == $url) return $url;
-        $url = preg_replace('|[^a-z0-9-~+_.?#=!&;,/:%@]|i', '', $url);
+        $url = preg_replace('|[^a-z0-9-~+_.?#=!&;,/:%@()]|i', '', $url); 
         $strip = array('%0d', '%0a');
         $url = str_replace($strip, '', $url);
         $url = str_replace(';//', '://', $url);