Indian Phone Number Regex for JavaScript

What this pattern does

This page provides a comprehensive, battle-tested regular expression for matching indian phone number, ported and verified for JavaScript. A rigorously tested regex reduces debugging time and protects your application from edge-case failures. 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 Phone Number
// ReDoS-safe | RegexVault — Localization > Phone Numbers

const indianPhoneNumberRegex = /^(?:\+91[\s.-]?)?(?!09)([6-9][0-9]{9}|0[1-9][0-9]{1,2}[\s.-]?[0-9]{7,8})$/;

function validateIndianPhoneNumber(input: string): boolean {
  return indianPhoneNumberRegex.test(input);
}

// Example
console.log(validateIndianPhoneNumber("+91 9876543210")); // true

Test Cases

When to use this pattern

This pattern is drawn from the Localization > Phone Numbers 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

Indian mobile numbers are 10 digits starting with 6-9 (5 is currently unassigned). Landlines include city code (011 for Delhi, 022 for Mumbai) + 7-8 digit local number. Country code is +91.