Add quotes to split URLs on regex

Author: Marco Pereirinha

php/class-utils.php

@@ -522,8 +522,8 @@ public static function is_admin() {
 	public static function extract_urls( $content ) {
 		preg_match_all(
 			"#([\"']?)("
-				. '(?:([\w-]+:)?//?)'
-				. '[^\s()<>]+'
+				. '(?:[\w-]+:)?//?'
+				. '[^\s()<>"\']+'
 				. '[.]'
 				. '(?:'
 					. '\([\w\d]+\)|'