SEDOL Regex for JavaScript

What this pattern does

This page provides a well-structured, multi-part regular expression for matching sedol, 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

// SEDOL
// ReDoS-safe | RegexVault — Finance > Securities & Trading

const sedolRegex = /^[B-DF-HJ-NP-TV-Z0-9]{6}[0-9]$/;

function validateSedol(input: string): boolean {
  return sedolRegex.test(input);
}

// Example
console.log(validateSedol("0263494")); // true

Test Cases

When to use this pattern

This pattern is drawn from the Finance > Securities & Trading 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

SEDOL is the UK equivalent of CUSIP. Since 2004, SEDOLs use alphanumeric characters (excluding vowels A, E, I, O, U). Older SEDOLs are 7 digits. Check digit uses a weighted sum mod 10.