Monetary Amount with Currency Code Regex for JavaScript

What this pattern does

This page provides a comprehensive, battle-tested regular expression for matching monetary amount with currency code, 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

// Monetary Amount with Currency Code
// ReDoS-safe | RegexVault — Finance > Currency & Money

const monetaryAmountWithCurrencyCodeRegex = /^(?:([A-Z]{3})\s)?-?(?:(?:[0-9]+(?:,[0-9]{3})*)|0)(?:\.[0-9]{1,4})?(?:\s([A-Z]{3}))?$/;

function validateMonetaryAmountWithCurrencyCode(input: string): boolean {
  return monetaryAmountWithCurrencyCodeRegex.test(input);
}

// Example
console.log(validateMonetaryAmountWithCurrencyCode("USD 1,234.56")); // true

Test Cases

When to use this pattern

This pattern is drawn from the Finance > Currency & Money 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

Capture group 1: prefix currency code, group 2: suffix currency code. Validate that only one is present at application level. Up to 4 decimal places to accommodate currencies like JPY (0) and BHD (3).