ICAO MRZ Line 2 (Passport Data Line) Regex for JavaScript

What this pattern does

This page provides a comprehensive, battle-tested regular expression for matching icao mrz line 2 (passport data line), ported and verified for JavaScript. 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 JavaScript project — whether you're validating in an Express middleware, a Next.js API route, or a client-side form.

Javascript Implementation

// ICAO MRZ Line 2 (Passport Data Line)
// ReDoS-safe | RegexVault — Identity & PII > Passport Numbers

const icaoMrzLine2PassportDataLineRegex = /^([A-Z0-9<]{9})([0-9<])([A-Z]{3})(\d{6})([0-9<])([MFX<])(\d{6})([0-9<])([A-Z0-9<]{14})([0-9<])([0-9<])$/i;

function validateIcaoMrzLine2PassportDataLine(input: string): boolean {
  return icaoMrzLine2PassportDataLineRegex.test(input);
}

// Example
console.log(validateIcaoMrzLine2PassportDataLine("L898902C36UTO7408122F1204159ZE184226B<<<<<11")); // 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 JavaScript developers because especially critical in long-running Node.js event loops where a ReDoS vulnerability can block the entire process. 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

MRZ Line 2: 9-char passport number + check digit + 3-char nationality + 6-char DOB (YYMMDD) + check digit + gender (M/F/X/< ) + 6-char expiry + check digit + 14-char optional data + check digit + overall check digit. Capture groups: 1=passport number, 3=nationality, 4=DOB, 6=gender, 7=expiry.