Ethereum Checksummed Address (EIP-55) Regex for Go

What this pattern does

This page provides a well-structured, multi-part regular expression for matching ethereum checksummed address (eip-55), ported and verified for Go. Financial data validation has zero tolerance for false negatives — a missed invalid entry can corrupt downstream calculations. 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

// Ethereum Checksummed Address (EIP-55)
// ReDoS-safe | RegexVault — Finance > Crypto

package validation

import "regexp"

var ethereumChecksummedAddressEip55Re = regexp.MustCompile(`^0x(?:[0-9A-F]{40}|[0-9a-f]{40}|(?:[0-9a-fA-F]{40}))$`)

func ValidateEthereumChecksummedAddressEip55(s string) bool {
    return ethereumChecksummedAddressEip55Re.MatchString(s)
}

// Example
// fmt.Println(ValidateEthereumChecksummedAddressEip55("0xAb8483F64d9C6d1EcF9b849Ae677dD3315835cb2")) // true

Test Cases

When to use this pattern

This pattern is drawn from the Finance > Crypto 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

EIP-55 checksum embeds a SHA3 hash of the lowercase address in the casing of the hex letters. A correctly checksummed address has mixed case. Regex alone cannot verify EIP-55 — use a library. This pattern just validates the format.