German PLZ (Postleitzahl) Regex for Go

What this pattern does

This page provides a lightweight, single-purpose regular expression for matching german plz (postleitzahl), 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

// German PLZ (Postleitzahl)
// ReDoS-safe | RegexVault — Localization > Postal Codes

package validation

import "regexp"

var germanPlzPostleitzahlRe = regexp.MustCompile(`^(0[1-9]|[1-9][0-9])[0-9]{3}$`)

func ValidateGermanPlzPostleitzahl(s string) bool {
    return germanPlzPostleitzahlRe.MatchString(s)
}

// Example
// fmt.Println(ValidateGermanPlzPostleitzahl("10115")) // true

Test Cases

When to use this pattern

This pattern is drawn from the Localization > Postal Codes 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

German PLZ ranges: 01xxx-09xxx (east), 10xxx-14xxx (Berlin/Brandenburg), etc. The code 00000 is explicitly invalid. Also used in Austria (4 digits — different pattern) and Switzerland (4 digits). Use this only for Germany.