Ticket #21624: 21624.patch

wp-includes/formatting.php

@@ -3235 +3235 @@
  * @return string URLs starting with the http or https protocol, separated by a carriage return.
  */
 function sanitize_trackback_urls( $to_ping ) {
-        $urls_to_ping = preg_split( '/\r\n\t /', trim( $to_ping ), -1, PREG_SPLIT_NO_EMPTY );
+        $urls_to_ping = preg_split( '/[\r\n\t ]+/', trim( $to_ping ), -1, PREG_SPLIT_NO_EMPTY );
         foreach ( $urls_to_ping as $k => $url ) {
                 if ( !preg_match( '#^https?://.#i', $url ) )
                         unset( $urls_to_ping[$k] );