Ticket #23587: miqro-23587.2.patch

src/wp-includes/rewrite.php

@@ -362 +362 @@
                 if ( !empty($url) && ($url != $request) && (strpos($match, $url) === 0) )
                         $request_match = $url . '/' . $request;
 
-                if ( preg_match("!^$match!", $request_match, $matches) ) {
+                $pattern = preg_replace( '/(?<=^|[^\\\\])((?:\\\\\\\\)*)@/', '$1\@', $match ); // Slash any @ not preceded by an odd number of slashes.
+                $pattern = '@^' . $pattern . '@';
 
+                if ( preg_match($pattern, $request_match, $matches) ) {
+
                         if ( $wp_rewrite->use_verbose_page_rules && preg_match( '/pagename=\$matches\[([0-9]+)\]/', $query, $varmatch ) ) {
                                 // this is a verbose page match, lets check to be sure about it
                                 if ( ! get_page_by_path( $matches[ $varmatch[1] ] ) )