Bank Account Number (Generic Sensitive) Regex for JavaScript

What this pattern does

This page provides a lightweight, single-purpose regular expression for matching bank account number (generic sensitive), ported and verified for JavaScript. Identity and credential patterns need both correctness and safety, since they're frequent targets for adversarial input. 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

// Bank Account Number (Generic Sensitive)
// ReDoS-safe | RegexVault — Identity & PII > Financial PII

const bankAccountNumberGenericSensitiveRegex = /^[0-9]{6,18}$/;

function validateBankAccountNumberGenericSensitive(input: string): boolean {
  return bankAccountNumberGenericSensitiveRegex.test(input);
}

// Example
console.log(validateBankAccountNumberGenericSensitive("123456")); // true

Test Cases

When to use this pattern

This pattern is drawn from the Identity & PII > Financial PII 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

Bank account numbers vary widely by country: UK 8 digits, US 5-17 digits, Singapore 9-12 digits, India 11-16 digits. This pattern covers the practical range. Always combine with routing/sort code for unambiguous bank identification.