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<?php
/*
* This file is part of Respect/Validation.
*
* (c) Alexandre Gomes Gaigalas <[email protected]>
* For the full copyright and license information, please view the "LICENSE.md"
* file that was distributed with this source code.
*/
declare(strict_types=1);
namespace Respect\Validation\Rules;
use function implode;
use function is_scalar;
use function preg_match;
use function sprintf;
/**
* Validates whether the input is a valid ISBN (International Standard Book Number) or not.
* @author Henrique Moody <[email protected]>
* @author Moritz Fromm <[email protected]>
final class Isbn extends AbstractRule
{
* @see https://howtodoinjava.com/regex/java-regex-validate-international-standard-book-number-isbns
private const PIECES = [
'^(?:ISBN(?:-1[03])?:? )?(?=[0-9X]{10}$|(?=(?:[0-9]+[- ]){3})',
'[- 0-9X]{13}$|97[89][0-9]{10}$|(?=(?:[0-9]+[- ]){4})[- 0-9]{17}$)',
'(?:97[89][- ]?)?[0-9]{1,5}[- ]?[0-9]+[- ]?[0-9]+[- ]?[0-9X]$',
];
* {@inheritdoc}
public function validate($input): bool
if (!is_scalar($input)) {
return false;
}
return preg_match(sprintf('/%s/', implode(self::PIECES)), $input) > 0;