getVatPattern example

return;
        }

        if (!is_iterable($vatIds)) {
            throw new UnexpectedValueException($vatIds, 'iterable');
        }

        if (!$this->shouldCheckVatIdFormat($constraint)) {
            return;
        }

        if (!$vatPattern = $this->getVatPattern($constraint)) {
            return;
        }

        $regex = '/^' . $vatPattern . '$/i';

        foreach ($vatIds as $vatId) {
            if (!preg_match($regex, (string) $vatId)) {
                $this->context->buildViolation($constraint->message)
                    ->setParameter('{{ vatId }}', $this->formatValue($vatId))
                    ->setCode(CustomerVatIdentification::VAT_ID_FORMAT_NOT_CORRECT)
                    ->addViolation();
            }