RegExpValidator.php

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

class RegExpValidator extends \TYPO3\CMS\Form\Validation\AbstractValidator {

    const LOCALISATION_OBJECT_NAME = 'tx_form_system_validate_regexp';

    protected $regularExpression;

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

    public function isValid() {
        if ($this->requestHandler->has($this->fieldName)) {
            $value = $this->requestHandler->getByMethod($this->fieldName);
            if (!preg_match($this->regularExpression, $value)) {
                return FALSE;
            }
        }
        return TRUE;
    }

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

}