Faker\Test\Provider\es_ES\PaymentTest::respectsDocPattern PHP Method

    function respectsDocPattern($givenString, $pattern)
    {
        $isValid = FALSE;
        $fixedString = strtoupper($givenString);
        if (is_int(substr($fixedString, 0, 1))) {
            $fixedString = substr("000000000" . $givenString, -9);
        }
        if (preg_match($pattern, $fixedString)) {
            $isValid = TRUE;
        }
        return $isValid;
    }