URL with Port Number Regex for JavaScript

What this pattern does

This page provides a comprehensive, battle-tested regular expression for matching url with port number, 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 Port Number
// ReDoS-safe | RegexVault — Web & Network > URL

const urlWithPortNumberRegex = /^https?:\/\/(?:[a-zA-Z0-9\-]+\.)+[a-zA-Z]{2,63}:(6553[0-5]|655[0-2][0-9]|65[0-4][0-9]{2}|6[0-4][0-9]{3}|[1-5][0-9]{4}|[1-9][0-9]{0,3})(?:\/[^\s]*)?$/i;

function validateUrlWithPortNumber(input: string): boolean {
  return urlWithPortNumberRegex.test(input);
}

// Example
console.log(validateUrlWithPortNumber("https://example.com:443")); // 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

Port range strictly enforced as 1–65535. Port 0 is excluded. Default ports (80 for HTTP, 443 for HTTPS) are not required to be present.