Indian PIN Code Regex for Python

What this pattern does

This page provides a lightweight, single-purpose regular expression for matching indian pin 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

# Indian PIN Code
# ReDoS-safe | RegexVault — Localization > Postal Codes

import re

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

def validate_indian_pin_code(value: str) -> bool:
    return bool(indian_pin_code_pattern.fullmatch(value))

# Example
print(validate_indian_pin_code("110001"))  # 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

Indian PIN code structure: first digit = postal zone (1-9, excludes 0), second digit = sub-zone, third digit = sorting district, last 3 digits = individual post office. Delhi is 110xxx, Mumbai is 400xxx.