Fixed pattern for PHP 7.3

Author: paquettg

src/PHPHtmlParser/Selector.php

@@ -21,7 +21,7 @@ class Selector
      *
      * @var string
      */
-    protected $pattern = "/([\w-:\*>]*)(?:\#([\w-]+)|\.([\w-]+))?(?:\[@?(!?[\w-:]+)(?:([!*^$]?=)[\"']?(.*?)[\"']?)?\])?([\/, ]+)/is";
+    protected $pattern = "/([\w\-:\*>]*)(?:\#([\w\-]+)|\.([\w\-]+))?(?:\[@?(!?[\w\-:]+)(?:([!*^$]?=)[\"']?(.*?)[\"']?)?\])?([\/, ]+)/is";
 
     protected $selectors = [];