IBAN (Germany — DE) Regex for JavaScript

What this pattern does

This page provides a lightweight, single-purpose regular expression for matching iban (germany — de), 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

// IBAN (Germany — DE)
// ReDoS-safe | RegexVault — Finance > Bank Identifiers

const ibanGermanyDeRegex = /^DE[0-9]{20}$/;

function validateIbanGermanyDe(input: string): boolean {
  return ibanGermanyDeRegex.test(input);
}

// Example
console.log(validateIbanGermanyDe("DE89370400440532013000")); // true

Test Cases

When to use this pattern

This pattern is drawn from the Finance > Bank Identifiers 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

German IBANs are always 22 characters (DE + 20 digits). The BLZ (Bankleitzahl) is the 8-digit bank routing code. Account numbers are right-padded with zeros to 10 digits.