ISBN-13 in JS
Match 13-digit ISBNs starting with 978 or 979, with optional hyphens or spaces.
Try it in the JS tester →Pattern
regexJS
\b97[89][\- ]?(?:\d[\- ]?){9}\d\b (flags: g)JavaScript / ECMAScript code
jsJavaScript
const re = new RegExp("\\b97[89][\\- ]?(?:\\d[\\- ]?){9}\\d\\b", "g");
const input = "978-0-306-40615-7";
const matches = [...input.matchAll(re)];
console.log(matches.map(m => m[0]));Uses `String.prototype.matchAll` for global iteration (Node 12+ / all modern browsers).
How the pattern works
The 978 or 979 GS1 prefix anchors the match, followed by nine digits (with optional separators) and a final check digit.
Examples
Input
978-0-306-40615-7Matches
978-0-306-40615-7
Input
9780306406157Matches
9780306406157