Brazilian Date Format (DD/MM/YYYY) Regex for Go

What this pattern does

This page provides a well-structured, multi-part regular expression for matching brazilian date format (dd/mm/yyyy), 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

// Brazilian Date Format (DD/MM/YYYY)
// ReDoS-checked | RegexVault — Localization > Date Formats

package validation

import "regexp"

var brazilianDateFormatDdmmyyyyRe = regexp.MustCompile(`^(0?[1-9]|[12][0-9]|3[01])/(0?[1-9]|1[0-2])/((?:19|20)[0-9]{2})$`)

func ValidateBrazilianDateFormatDdmmyyyy(s string) bool {
    return brazilianDateFormatDdmmyyyyRe.MatchString(s)
}

// Example
// fmt.Println(ValidateBrazilianDateFormatDdmmyyyy("15/01/2024")) // true

Test Cases

When to use this pattern

This pattern is drawn from the Localization > Date Formats category and has been checked for ReDoS risk. 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

Brazil uses DD/MM/YYYY universally. Same regex as UK/European — apply locale context. Portuguese date format occasionally written as 15 de janeiro de 2024 (long form) which requires a different pattern.