MAC Address (Hyphen-Separated) Regex for JavaScript

What this pattern does

This page provides a well-structured, multi-part regular expression for matching mac address (hyphen-separated), ported and verified for JavaScript. A rigorously tested regex reduces debugging time and protects your application from edge-case failures. 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

// MAC Address (Hyphen-Separated)
// ReDoS-safe | RegexVault — Web & Network > MAC Address

const macAddressHyphenseparatedRegex = /^[0-9a-fA-F]{2}(?:-[0-9a-fA-F]{2}){5}$/;

function validateMacAddressHyphenseparated(input: string): boolean {
  return macAddressHyphenseparatedRegex.test(input);
}

// Example
console.log(validateMacAddressHyphenseparated("00-1A-2B-3C-4D-5E")); // true

Test Cases

When to use this pattern

This pattern is drawn from the Web & Network > MAC Address 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

Windows uses hyphen-separated notation in ARP tables and ipconfig. Accept both hyphen and colon formats in user-facing inputs.