ISO 20022 Message Type Regex for JavaScript

What this pattern does

This page provides a well-structured, multi-part regular expression for matching iso 20022 message type, ported and verified for JavaScript. Financial data validation has zero tolerance for false negatives — a missed invalid entry can corrupt downstream calculations. 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

// ISO 20022 Message Type
// ReDoS-safe | RegexVault — Finance > Financial Formats

const iso20022MessageTypeRegex = /^[a-z]{4}\.[0-9]{3}\.[0-9]{3}\.[0-9]{2}$/;

function validateIso20022MessageType(input: string): boolean {
  return iso20022MessageTypeRegex.test(input);
}

// Example
console.log(validateIso20022MessageType("pacs.008.001.08")); // true

Test Cases

When to use this pattern

This pattern is drawn from the Finance > Financial Formats 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

ISO 20022 message ID: 4-char business area (pacs=payments clearing, pain=payment initiation, camt=cash management, sese=settlement) + 3-digit message number + 001 (version) + 2-digit variant.