Codice Fiscale - validazione

add_filter('sln.shortcode.details.dispatchForm.validate_bind_values', function ($isValid, $values, $step) {
        if (isset($values['codice_fiscale'])) {
            $codiceFiscale = $values['codice_fiscale'];
            $pattern = "/^[A-Za-z]{6}[0-9LMNPQRSTUV]{2}[A-Za-z]{1}[0-9LMNPQRSTUV]{2}[A-Za-z]{1}[0-9LMNPQRSTUV]{3}[A-Za-z]{1}$/i";
            if (strlen($codiceFiscale) !== 16 || !preg_match($pattern, $codiceFiscale)) {
                $step->addError(__('Codice fiscale errato', 'salon-booking-system'));
                $isValid = false;
            }
        }

        return $isValid;
    }, 10, 3);