/**
     * {@inheritdoc}
     */
    protected function buildFindCommand(Command $command, $dir)
    {
        parent::buildFindCommand($command, $dir)->addAtIndex('-E', 1);

        return $command;
    }
 /**
  * {@inheritdoc}
  */
 protected function buildFindCommand(Command $command, $dir)
 {
     return parent::buildFindCommand($command, $dir)->add('-regextype posix-extended');
 }