Singapore Driving Licence Number Regex for PHP

What this pattern does

This page provides a lightweight, single-purpose regular expression for matching singapore driving licence number, ported and verified for PHP. 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 PHP project — whether you're validating in a Laravel validator, a WordPress plugin, or a standalone PHP script.

Php Implementation

<?php
// Singapore Driving Licence Number
// ReDoS-safe | RegexVault — Identity & PII > Driver's License Numbers

define('SINGAPORE_DRIVING_LICENCE_NUMBER_PATTERN', '/^[STFG][0-9]{7}[A-Z]$/');

function validate_singapore_driving_licence_number(string $input): bool {
    return (bool) preg_match(SINGAPORE_DRIVING_LICENCE_NUMBER_PATTERN, $input);
}

// Example
var_dump(validate_singapore_driving_licence_number("S1234567D")); // bool(true)

Test Cases

When to use this pattern

This pattern is drawn from the Identity & PII > Driver's License Numbers category and carries a ReDoS-safe certification. That matters for PHP developers because especially relevant in PHP where PCRE backtracking limits can trigger silent failures on malicious input. 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

Singapore driving licences use the same number as the NRIC for Singapore citizens and PRs. Foreign nationals have a FIN-based licence number. Same format as pii-nid-01 — the licence number IS the NRIC/FIN number.