URL with User Authentication Regex for JavaScript

What this pattern does

This page provides a comprehensive, battle-tested regular expression for matching url with user authentication, 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

// URL with User Authentication
// ReDoS-safe | RegexVault — Web & Network > URL

const urlWithUserAuthenticationRegex = /^https?:\/\/[a-zA-Z0-9._~!$&'()*+,;=%-]+(?::[a-zA-Z0-9._~!$&'()*+,;=%-]*)?@(?:[a-zA-Z0-9\-]+\.)+[a-zA-Z]{2,63}(?::[1-9][0-9]{0,4})?(?:\/[^\s]*)?$/i;

function validateUrlWithUserAuthentication(input: string): boolean {
  return urlWithUserAuthenticationRegex.test(input);
}

// Example
console.log(validateUrlWithUserAuthentication("http://user:password@example.com")); // true

Test Cases

When to use this pattern

This pattern is drawn from the Web & Network > URL 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

Embedding credentials in URLs is a significant security risk — they appear in browser history, server logs, and referrer headers. Use Authorization headers instead.