TLD Validation (2–6 Character) Regex for JavaScript

What this pattern does

This page provides a lightweight, single-purpose regular expression for matching tld validation (2–6 character), 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

// TLD Validation (2–6 Character)
// ReDoS-safe | RegexVault — Web & Network > Domain

const tldValidation26CharacterRegex = /^[a-zA-Z]{2,6}$/;

function validateTldValidation26Character(input: string): boolean {
  return tldValidation26CharacterRegex.test(input);
}

// Example
console.log(validateTldValidation26Character("com")); // true

Test Cases

When to use this pattern

This pattern is drawn from the Web & Network > Domain 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

New gTLDs (e.g., .photography, .construction) can be up to 24 characters. Adjust the upper bound to {2,24} if validating modern TLDs. The IANA TLD list is the authoritative source.