Date Range (ISO 8601) Regex for Go

What this pattern does

This page provides a comprehensive, battle-tested regular expression for matching date range (iso 8601), 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

// Date Range (ISO 8601)
// ReDoS-safe | RegexVault — Localization > Date Formats

package validation

import "regexp"

var dateRangeIso8601Re = regexp.MustCompile(`^((?:19|20)[0-9]{2}-(?:0[1-9]|1[0-2])-(?:0[1-9]|[12][0-9]|3[01]))/((?:19|20)[0-9]{2}-(?:0[1-9]|1[0-2])-(?:0[1-9]|[12][0-9]|3[01]))$`)

func ValidateDateRangeIso8601(s string) bool {
    return dateRangeIso8601Re.MatchString(s)
}

// Example
// fmt.Println(ValidateDateRangeIso8601("2024-01-01/2024-12-31")) // true

Test Cases

When to use this pattern

This pattern is drawn from the Localization > Date Formats 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

Capture group 1: start date, group 2: end date. This pattern does not validate that the start date precedes the end date — enforce that at application level. ISO 8601 also supports duration syntax (P1Y/2024-01-01) not covered here.