ICCID (SIM Card Serial Number) Regex for PHP

What this pattern does

This page provides a lightweight, single-purpose regular expression for matching iccid (sim card serial 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
// ICCID (SIM Card Serial Number)
// ReDoS-safe | RegexVault — Identity & PII > Digital Identity

define('ICCID_SIM_CARD_SERIAL_NUMBER_PATTERN', '/^[0-9]{18,22}[F]?$/');

function validate_iccid_sim_card_serial_number(string $input): bool {
    return (bool) preg_match(ICCID_SIM_CARD_SERIAL_NUMBER_PATTERN, $input);
}

// Example
var_dump(validate_iccid_sim_card_serial_number("896491061700000001")); // bool(true)

Test Cases

When to use this pattern

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

ICCID structure: 89 (telecom industry code) + country code + carrier code + individual account ID + Luhn check digit. Some ICCIDs end in F (filler). Length varies: 18-22 digits. Identifies the SIM card, not the subscriber (MSISDN/phone number).