Price/Quote with Tick Size Regex for JavaScript

What this pattern does

This page provides a lightweight, single-purpose regular expression for matching price/quote with tick size, 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

// Price/Quote with Tick Size
// ReDoS-safe | RegexVault — Finance > Currency & Money

const pricequoteWithTickSizeRegex = /^[0-9]+(?:\.[0-9]{1,8})?$/;

function validatePricequoteWithTickSize(input: string): boolean {
  return pricequoteWithTickSizeRegex.test(input);
}

// Example
console.log(validatePricequoteWithTickSize("1.2345")); // 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

Up to 8 decimal places covers BTC satoshi precision (0.00000001 BTC = 1 satoshi). FX prices conventionally use 4-5 decimal places (pips). Equities use 2. Reject negative prices at application level.