Liip\RMT\Information\InteractiveQuestion::getValidator PHP Method

    public function getValidator()
    {
        return array($this, 'validate');
    }

 protected function askQuestion(InteractiveQuestion $question)
 {
     $dialog = $this->getHelperSet()->get('dialog');
     return $dialog->askAndValidate($this->getOutput(), $question->getFormatedText(), $question->getValidator(), false, $question->getDefault());
 }