Chinese Postal Code Regex for Python

What this pattern does

This page provides a lightweight, single-purpose regular expression for matching chinese postal code, ported and verified for Python. A rigorously tested regex reduces debugging time and protects your application from edge-case failures. 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 Postal Code
# ReDoS-safe | RegexVault — Localization > Postal Codes

import re

chinese_postal_code_pattern = re.compile(r'^[1-9][0-9]{5}$')

def validate_chinese_postal_code(value: str) -> bool:
    return bool(chinese_postal_code_pattern.fullmatch(value))

# Example
print(validate_chinese_postal_code("100000"))  # True

Test Cases

When to use this pattern

This pattern is drawn from the Localization > Postal Codes 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

Chinese postal codes: first two digits represent province (10=Beijing, 20=Shanghai, 21=Liaoning, 31=Shanghai municipality, 44=Guangdong, 61=Shaanxi). China Post manages the assignment. Hong Kong and Macau do not use postal codes.