Chinese Citizen ID Number (Shenfenzheng) Regex for Python

What this pattern does

This page provides a comprehensive, battle-tested regular expression for matching chinese citizen id number (shenfenzheng), 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

# Chinese Citizen ID Number (Shenfenzheng)
# ReDoS-safe | RegexVault — Identity & PII > National Identity Numbers

import re

chinese_citizen_id_number_shenfenzheng_pattern = re.compile(r'^[1-8][0-9]{5}((?:19|20)[0-9]{2})(0[1-9]|1[0-2])(0[1-9]|[12][0-9]|3[01])[0-9]{3}[0-9X]$')

def validate_chinese_citizen_id_number_shenfenzheng(value: str) -> bool:
    return bool(chinese_citizen_id_number_shenfenzheng_pattern.fullmatch(value))

# Example
print(validate_chinese_citizen_id_number_shenfenzheng("110101199003077515"))  # True

Test Cases

When to use this pattern

This pattern is drawn from the Identity & PII > National Identity Numbers 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

Structure: 6-digit region code (first digit 1-8) + 8-digit birthdate (YYYYMMDD) + 3-digit sequence + 1 check character. Check character X represents 10. Region code first digit 1-8 corresponds to Chinese provinces (9 not currently used for mainland). Checksum uses ISO 7064 MOD 11-2.