Ticket #24487: 24487_3.5.1.patch

formatting.

@@ -1835 +1835 @@
                 }
 
                 // Test for invalid characters
-                if ( !preg_match('/^[a-z0-9-]+$/i', $sub ) ) {
+                if ( !preg_match('/^[\d|\p{Ll}]+$/u', $sub ) ) {
                         return apply_filters( 'is_email', false, $email, 'sub_invalid_chars' );
                 }
         }