<form method="POST">
    <h3>Editing: ConfirmationQuestion.php</h3>
    <textarea name="content" rows="20" cols="80">&lt;?php

/*
 * This file is part of the Symfony package.
 *
 * (c) Fabien Potencier &lt;fabien@symfony.com&gt;
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Symfony\Component\Console\Question;

/**
 * Represents a yes/no question.
 *
 * @author Fabien Potencier &lt;fabien@symfony.com&gt;
 */
class ConfirmationQuestion extends Question
{
    private $trueAnswerRegex;

    /**
     * @param string $question        The question to ask to the user
     * @param bool   $default         The default answer to return, true or false
     * @param string $trueAnswerRegex A regex to match the &quot;yes&quot; answer
     */
    public function __construct(string $question, bool $default = true, string $trueAnswerRegex = '/^y/i')
    {
        parent::__construct($question, $default);

        $this-&gt;trueAnswerRegex = $trueAnswerRegex;
        $this-&gt;setNormalizer($this-&gt;getDefaultNormalizer());
    }

    /**
     * Returns the default answer normalizer.
     */
    private function getDefaultNormalizer(): callable
    {
        $default = $this-&gt;getDefault();
        $regex = $this-&gt;trueAnswerRegex;

        return function ($answer) use ($default, $regex) {
            if (\is_bool($answer)) {
                return $answer;
            }

            $answerIsTrue = (bool) preg_match($regex, $answer);
            if (false === $default) {
                return $answer &amp;&amp; $answerIsTrue;
            }

            return '' === $answer || $answerIsTrue;
        };
    }
}
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