code: private function getUrlMatches()
      {
          $flags = GLOB_MARK | GLOB_ONLYDIR;
  
          if (defined('GLOB_BRACE')) {
              $flags |= GLOB_BRACE;
          } elseif (strpos($this->url, '{') !== false || strpos($this->url, '}') !== false) {
              throw new \RuntimeException('The operating system does not support GLOB_BRACE which is required for the url '. $this->url);
          }
  
          // Ensure environment-specific path separators are normalized to URL separators
          return array_map(function ($val) {
              return rtrim(str_replace(DIRECTORY_SEPARATOR, '/', $val), '/');
          }, glob($this->url, $flags));
      }
docs: Get a list of all (possibly relative) path names matching given url (supports globbing).
  
  @return string[]