public function __construct($placeholder = array('twital', 'twital'), array $options = array())
{
parent::__construct($placeholder, $options);
$this->regexes = array_merge($this->regexes, array('placeholder' => '{( ?)(' . preg_quote($placeholder[0]) . '[a-z0-9]+?' . preg_quote($placeholder[1]) . ')}iu'));
}