Ticket #23430: username-patch.patch

wp-includes/formatting.php

@@ -908 +908 @@
 
         // If strict, reduce to ASCII for max portability.
         if ( $strict )
-                $username = preg_replace( '|[^a-z0-9 _.\-@]|i', '', $username );
+                $username = preg_replace( '|[^a-z0-9+ _.\-@]|i', '', $username );
 
         $username = trim( $username );
         // Consolidate contiguous whitespace