RegExpFilter.php

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

class RegExpFilter implements \TYPO3\CMS\Form\Filter\FilterInterface {

    protected $regularExpression;

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

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

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

}