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vendor/workerman/validation/library/Rules/Isbn.php

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+<?php
+
+/*
+ * Copyright (c) Alexandre Gomes Gaigalas <alganet@gmail.com>
+ * SPDX-License-Identifier: MIT
+ */
+
+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 <henriquemoody@gmail.com>
+ * @author Moritz Fromm <moritzgitfromm@gmail.com>
+ */
+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)), (string) $input) > 0;
+    }
+}