RegExpValidator.php

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<?php
namespace TYPO3\CMS\Form\Domain\Validator;

/*
 * This file is part of the TYPO3 CMS project.
 *
 * It is free software; you can redistribute it and/or modify it under
 * the terms of the GNU General Public License, either version 2
 * of the License, or any later version.
 *
 * For the full copyright and license information, please read the
 * LICENSE.txt file that was distributed with this source code.
 *
 * The TYPO3 project - inspiring people to share!
 */

class RegExpValidator extends AbstractValidator
{
    protected $supportedOptions = [
        'element' => ['', 'The name of the element', 'string', true],
        'errorMessage' => ['', 'The error message', 'array', true],
        'expression' => ['', 'The regular expression', 'string', true],
    ];

    const LOCALISATION_OBJECT_NAME = 'tx_form_system_validate_regexp';

    public function isValid($value)
    {
        if (!preg_match($this->options['expression'], $value)) {
            $this->addError(
                $this->renderMessage(
                    $this->options['errorMessage'][0],
                    $this->options['errorMessage'][1],
                    'error'
                ),
                1441997233
            );
        }
    }
}