Trade Settlement Date (T+N) Regex for JavaScript

What this pattern does

This page provides a lightweight, single-purpose regular expression for matching trade settlement date (t+n), 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

// Trade Settlement Date (T+N)
// ReDoS-safe | RegexVault — Finance > Financial Formats

const tradeSettlementDateTnRegex = /^T\+(?:[0-9]|[1-9][0-9])$/;

function validateTradeSettlementDateTn(input: string): boolean {
  return tradeSettlementDateTnRegex.test(input);
}

// Example
console.log(validateTradeSettlementDateTn("T+0")); // 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

T = trade date, N = number of business days for settlement. US equities moved to T+1 in 2024. Most bonds settle T+2. Same-day (T+0) settlement is available for some instruments. T+30 or longer for private markets.