Indian IFSC Code Regex for JavaScript

What this pattern does

This page provides a lightweight, single-purpose regular expression for matching indian ifsc 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

// Indian IFSC Code
// ReDoS-safe | RegexVault — Finance > Bank Identifiers

const indianIfscCodeRegex = /^[A-Z]{4}0[A-Z0-9]{6}$/;

function validateIndianIfscCode(input: string): boolean {
  return indianIfscCodeRegex.test(input);
}

// Example
console.log(validateIndianIfscCode("SBIN0001234")); // true

Test Cases

When to use this pattern

This pattern is drawn from the Finance > Bank Identifiers 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

The 5th character is always 0 (zero, reserved for future use). Used for NEFT, RTGS, and IMPS transfers. The Reserve Bank of India maintains the authoritative IFSC directory.