US Passport Number Regex for Go

What this pattern does

This page provides a well-structured, multi-part regular expression for matching us passport number, 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

// US Passport Number
// ReDoS-safe | RegexVault — Identity & PII > Passport Numbers

package validation

import "regexp"

var usPassportNumberRe = regexp.MustCompile(`^[A-Z][0-9]{8}$|^[A-Z]{2}[0-9]{7}$`)

func ValidateUsPassportNumber(s string) bool {
    return usPassportNumberRe.MatchString(s)
}

// Example
// fmt.Println(ValidateUsPassportNumber("A12345678")) // true

Test Cases

When to use this pattern

This pattern is drawn from the Identity & PII > Passport 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

US passport books use 1 letter + 8 digits. US passport cards also use 9 alphanumeric characters. Older US passports may have different formats. The State Department does not publish the exact checksum algorithm.