IPv6 Full Expanded Form Regex for Go

What this pattern does

This page provides a well-structured, multi-part regular expression for matching ipv6 full expanded form, 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

// IPv6 Full Expanded Form
// ReDoS-safe | RegexVault — Web & Network > IPv6

package validation

import "regexp"

var ipv6FullExpandedFormRe = regexp.MustCompile(`^[0-9a-fA-F]{1,4}(?::[0-9a-fA-F]{1,4}){7}$`)

func ValidateIpv6FullExpandedForm(s string) bool {
    return ipv6FullExpandedFormRe.MatchString(s)
}

// Example
// fmt.Println(ValidateIpv6FullExpandedForm("2001:0db8:85a3:0000:0000:8a2e:0370:7334")) // true

Test Cases

When to use this pattern

This pattern is drawn from the Web & Network > IPv6 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

This matches only the fully expanded form. Does not accept :: compression. Each group can be 1–4 hex digits (leading zeros optional within group).