Add ISBN validator regex and utility function (#1436)

Author: yuvraj1107thapa

Regular Expressions/ISBN Validator/README.md

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+# ISBN Validator Regular Expression
+
+This JavaScript module provides a regular expression for validating International Standard Book Numbers (ISBNs). It supports both ISBN-10 and ISBN-13 formats, including variations with or without hyphens and spaces.
+
+## Features
+
+- Validates ISBN-10 and ISBN-13 formats
+- Supports ISBNs with or without hyphens/spaces
+- Accepts ISBNs with or without the "ISBN" prefix
+
+## Usage
+
+```javascript
+const isbnRegex = /^(?: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]$/;
+
+function validateISBN(isbn) {
+  return isbnRegex.test(isbn);
+}
+
+// Example usage:
+console.log(validateISBN('ISBN 978-0-596-52068-7')); // true
+console.log(validateISBN('0-596-52068-9')); // true
+console.log(validateISBN('0 512 52068 9')); // false
+```

Regular Expressions/ISBN Validator/validateISBN.js

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+// ISBN Validator
+// This regex validates both ISBN-10 and ISBN-13 formats
+
+const isbnRegex = /^(?: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]$/;
+
+function validateISBN(isbn) {
+  return isbnRegex.test(isbn);
+}
+
+// Example usage:
+console.log(validateISBN('ISBN 978-0-596-52068-7')); // true
+console.log(validateISBN('0-596-52068-9')); // true
+console.log(validateISBN('0 512 52068 9')); // false