TLD Validation (2–6 Character) Regex for Go

What this pattern does

This page provides a lightweight, single-purpose regular expression for matching tld validation (2–6 character), ported and verified for Go. A rigorously tested regex reduces debugging time and protects your application from edge-case failures. The snippet below is ready to drop into your Go project — whether you're validating in a Gin handler, a gRPC service, or a command-line tool.

Go Implementation

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

package validation

import "regexp"

var tldValidation26CharacterRe = regexp.MustCompile(`^[a-zA-Z]{2,6}$`)

func ValidateTldValidation26Character(s string) bool {
    return tldValidation26CharacterRe.MatchString(s)
}

// Example
// fmt.Println(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 Go developers because Go's RE2 engine is inherently safe from catastrophic backtracking, but this pattern has been additionally verified for correctness. 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.