Thai National ID (บัตรประชาชน) Regex for Go

What this pattern does

This page provides a lightweight, single-purpose regular expression for matching thai national id (บัตรประชาชน), ported and verified for Go. Identity and credential patterns need both correctness and safety, since they're frequent targets for adversarial input. 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

// Thai National ID (บัตรประชาชน)
// ReDoS-safe | RegexVault — Identity & PII > National Identity Numbers

package validation

import "regexp"

var thaiNationalIdRe = regexp.MustCompile(`^[1-9][0-9]{12}$`)

func ValidateThaiNationalId(s string) bool {
    return thaiNationalIdRe.MatchString(s)
}

// Example
// fmt.Println(ValidateThaiNationalId("1234567890123")) // true

Test Cases

When to use this pattern

This pattern is drawn from the Identity & PII > National Identity Numbers 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

Thai ID structure: region (1-8 for citizenship type), province/district/registration sequence (11 digits), check digit. First digit 1-8 = born in Thailand, 0 = illegal immigrant, 9 = not eligible. Checksum: sum of first 12 digits × weights (13-2), last digit = (11 - (sum mod 11)) mod 10.