RegExpFilter.php

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

/*
 * 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 RegExpFilter extends AbstractFilter implements FilterInterface
{
    protected $regularExpression;

    public function __construct(array $arguments = [])
    {
        $this->setRegularExpression($arguments['expression']);
    }

    public function setRegularExpression($expression)
    {
        $this->regularExpression = (string)$expression;
    }

    public function filter($value)
    {
        return preg_replace($this->regularExpression, '', (string)$value);
    }
}