ISO 8601 Log Timestamp Regex for Go

What this pattern does

This page provides a comprehensive, battle-tested regular expression for matching iso 8601 log timestamp, 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

// ISO 8601 Log Timestamp
// ReDoS-safe | RegexVault — Dev & Systems > Log Parsing

package validation

import "regexp"

var iso8601LogTimestampRe = regexp.MustCompile(`^(\d{4})-(0[1-9]|1[0-2])-(0[1-9]|[12]\d|3[01])T([01]\d|2[0-3]):([0-5]\d):([0-5]\d)(?:\.(\d{1,9}))?([+-][01]\d:[0-5]\d|Z)?`)

func ValidateIso8601LogTimestamp(s string) bool {
    return iso8601LogTimestampRe.MatchString(s)
}

// Example
// fmt.Println(ValidateIso8601LogTimestamp("2024-01-15T10:30:00Z")) // true

Test Cases

When to use this pattern

This pattern is drawn from the Dev & Systems > Log Parsing 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

Groups: 1=year, 2=month, 3=day, 4=hour, 5=minute, 6=second, 7=subseconds, 8=timezone. Subseconds accept up to 9 digits (nanosecond precision used by Go and Rust). Z = UTC.