UUID v1 Regex for JavaScript

What this pattern does

This page provides a well-structured, multi-part regular expression for matching uuid v1, 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

// UUID v1
// ReDoS-safe | RegexVault — Web & Network > Misc

const uuidV1Regex = /^[0-9a-f]{8}-[0-9a-f]{4}-1[0-9a-f]{3}-[89ab][0-9a-f]{3}-[0-9a-f]{12}$/i;

function validateUuidV1(input: string): boolean {
  return uuidV1Regex.test(input);
}

// Example
console.log(validateUuidV1("a8098c1a-f86e-11da-bd1a-00112444be1e")); // true

Test Cases

When to use this pattern

This pattern is drawn from the Web & Network > Misc 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

UUID v1 embeds the MAC address of the generating machine in the node field (last 12 hex chars) — a privacy concern. UUID v4 is preferred for security-sensitive identifiers.