Non-Standard / High Port Detection Regex for JavaScript

What this pattern does

This page provides a comprehensive, battle-tested regular expression for matching non-standard / high port detection, 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

// Non-Standard / High Port Detection
// ReDoS-safe | RegexVault — Web & Network > Port

const nonstandardHighPortDetectionRegex = /https?:\/\/[^:\/\s]+:([1-9][0-9]{3,4})(?=\/|\?|#|$)/i;

function validateNonstandardHighPortDetection(input: string): boolean {
  return nonstandardHighPortDetectionRegex.test(input);
}

// Example
console.log(validateNonstandardHighPortDetection("http://example.com:8080/path")); // true

Test Cases

When to use this pattern

This pattern is drawn from the Web & Network > Port 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

Capture group 1 contains the port number. Ports 1–999 (single and triple digits) are excluded — this targets 4–5 digit non-standard ports. Useful for security scanning and alerting.