South African Phone Number Regex for JavaScript

What this pattern does

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

// South African Phone Number
// ReDoS-safe | RegexVault — Localization > Phone Numbers

const southAfricanPhoneNumberRegex = /^(?:\+27[\s.-]?|0)([1-9][0-9])[\s.-]?([0-9]{3})[\s.-]?([0-9]{4})$/;

function validateSouthAfricanPhoneNumber(input: string): boolean {
  return southAfricanPhoneNumberRegex.test(input);
}

// Example
console.log(validateSouthAfricanPhoneNumber("+27 11 123 4567")); // 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

South African area codes: 010-011 (Johannesburg), 021 (Cape Town), 031 (Durban), 041 (Port Elizabeth). Mobile prefixes: 060-065 (Telkom), 071-079 (Vodacom), 081-083 (MTN). +27 replaces the leading 0.