Indian Aadhaar Number Regex for Python

What this pattern does

This page provides a well-structured, multi-part regular expression for matching indian aadhaar 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

# Indian Aadhaar Number
# ReDoS-safe | RegexVault — Identity & PII > National Identity Numbers

import re

indian_aadhaar_number_pattern = re.compile(r'^[2-9][0-9]{3}[\s-]?[0-9]{4}[\s-]?[0-9]{4}$')

def validate_indian_aadhaar_number(value: str) -> bool:
    return bool(indian_aadhaar_number_pattern.fullmatch(value))

# Example
print(validate_indian_aadhaar_number("234567890123"))  # 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

Aadhaar UIDs are issued by UIDAI to Indian residents. First digit cannot be 0 or 1 (a design choice to avoid confusion). The 12-digit number uses a Verhoeff checksum algorithm. Display format is typically XXXX XXXX XXXX.