extbase/Classes/Validation/Validator/AlphanumericValidator.php

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<?php
namespace TYPO3\CMS\Extbase\Validation\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 AlphanumericValidator extends AbstractValidator
{
    public function isValid($value)
    {
        if (!is_string($value) || preg_match('/^[\pL\d]*$/u', $value) !== 1) {
            $this->addError($this->translateErrorMessage('validator.alphanumeric.notvalid', 'extbase'), 1221551320);
        }
    }
}