Ticket #33924: 33924.patch

formatting.php

@@ -1598 +1598 @@
         $sanitized = preg_replace( '|%[a-fA-F0-9][a-fA-F0-9]|', '', $class );
 
         //Limit to A-Z,a-z,0-9,_,-
-        $sanitized = preg_replace( '/[^A-Za-z0-9_-]/', '', $sanitized );
+        $sanitized = preg_replace( '/[^A-Za-z0-9@_-]/', '', $sanitized );
 
         if ( '' == $sanitized )
                 $sanitized = $fallback;