ICCID (SIM Card Serial Number) Regex for Python

What this pattern does

This page provides a lightweight, single-purpose regular expression for matching iccid (sim card serial number), ported and verified for Python. 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 Python project — whether you're validating in a Django view, a FastAPI endpoint, or a standalone data processing script.

Python Implementation

# ICCID (SIM Card Serial Number)
# ReDoS-safe | RegexVault — Identity & PII > Digital Identity

import re

iccid_sim_card_serial_number_pattern = re.compile(r'^[0-9]{18,22}[F]?$')

def validate_iccid_sim_card_serial_number(value: str) -> bool:
    return bool(iccid_sim_card_serial_number_pattern.fullmatch(value))

# Example
print(validate_iccid_sim_card_serial_number("896491061700000001"))  # 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 Python developers because particularly important in Python web servers where CPU-bound regex operations can stall concurrent request handling. 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).