code: protected function handle(&$test, $filename)
      {
          if (preg_match($this->pattern, $filename)) {
              parent::handle($test, $filename);
          }
      }
docs: Attempts to add files that match a given pattern.
  
  @see SimpleCollector::_handle()
  
  @param object $test Group test with {@link GroupTest::addFile)} method.
  @param string $path Directory to scan.