AlphanumericValidator.php

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<?php
namespace TYPO3\CMS\Extbase\Validation\Validator;

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);
        }
    }
}