Australian Individual Healthcare Identifier (IHI) Regex for PHP

What this pattern does

This page provides a lightweight, single-purpose regular expression for matching australian individual healthcare identifier (ihi), 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
// Australian Individual Healthcare Identifier (IHI)
// ReDoS-safe | RegexVault — Identity & PII > Health Identifiers

define('AUSTRALIAN_INDIVIDUAL_HEALTHCARE_IDENTIFIER_IHI_PATTERN', '/^800360[0-9]{10}$/');

function validate_australian_individual_healthcare_identifier_ihi(string $input): bool {
    return (bool) preg_match(AUSTRALIAN_INDIVIDUAL_HEALTHCARE_IDENTIFIER_IHI_PATTERN, $input);
}

// Example
var_dump(validate_australian_individual_healthcare_identifier_ihi("8003601234567890")); // bool(true)

Test Cases

When to use this pattern

This pattern is drawn from the Identity & PII > Health Identifiers 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

IHI prefix is 800 360 (HI Service prefix). 16 digits total. Luhn check digit on the last digit. Used in the national health record system (My Health Record). Distinct from Medicare number — IHI is the national unique healthcare identifier.