Basis Points (bps) Regex for JavaScript

What this pattern does

This page provides a well-structured, multi-part regular expression for matching basis points (bps), 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

// Basis Points (bps)
// ReDoS-safe | RegexVault — Finance > Currency & Money

const basisPointsBpsRegex = /^-?(?:[0-9]{1,4}(?:\.[0-9]{1,2})?|10000(?:\.0{1,2})?)$/;

function validateBasisPointsBps(input: string): boolean {
  return basisPointsBpsRegex.test(input);
}

// Example
console.log(validateBasisPointsBps("0")); // 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

1 basis point = 0.01% = 0.0001. 100 bps = 1%. Used heavily in interest rate, spread, and fee contexts. Allows negative values for inverted spreads. Max 10000 bps = 100%.