Discover Card Number Regex for JavaScript

What this pattern does

This page provides a comprehensive, battle-tested regular expression for matching discover card number, ported and verified for JavaScript. Financial data validation has zero tolerance for false negatives — a missed invalid entry can corrupt downstream calculations. The snippet below is ready to drop into your JavaScript project — whether you're validating in an Express middleware, a Next.js API route, or a client-side form.

Javascript Implementation

// Discover Card Number
// ReDoS-safe | RegexVault — Finance > Card Numbers

const discoverCardNumberRegex = /^(?:6011[0-9]{12}|64[4-9][0-9]{13}|65[0-9]{14}|622(?:1(?:2[6-9]|[3-9][0-9])|[2-8][0-9]{2}|9(?:[01][0-9]|2[0-5]))[0-9]{10})$/;

function validateDiscoverCardNumber(input: string): boolean {
  return discoverCardNumberRegex.test(input);
}

// Example
console.log(validateDiscoverCardNumber("6011111111111117")); // true

Test Cases

When to use this pattern

This pattern is drawn from the Finance > Card Numbers category and carries a ReDoS-safe certification. That matters for JavaScript developers because especially critical in long-running Node.js event loops where a ReDoS vulnerability can block the entire process. RegexVault audits patterns against known backtracking attack vectors, ensuring you have the necessary context before using this regex in a high-stakes production environment.

Common Pitfalls

Technical Notes

Discover has multiple BIN ranges. The 622126-622925 range (UnionPay cobranded) was added later. Some validators miss the 644-649 and UnionPay ranges.