EmailValidator.php

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

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

    const LOCALISATION_OBJECT_NAME = 'tx_form_system_validate_email';

    public function isValid() {
        if ($this->requestHandler->has($this->fieldName)) {
            $value = $this->requestHandler->getByMethod($this->fieldName);
            if (!\TYPO3\CMS\Core\Utility\GeneralUtility::validEmail($value)) {
                return FALSE;
            }
        }
        return TRUE;
    }

}