Privacy Policy Version Identifier Regex for Python

What this pattern does

This page provides a comprehensive, battle-tested regular expression for matching privacy policy version identifier, 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

# Privacy Policy Version Identifier
# ReDoS-safe | RegexVault — Identity & PII > Consent & Compliance

import re

privacy_policy_version_identifier_pattern = re.compile(r'^v([0-9]+)\.([0-9]+)(?:\.([0-9]+))?(?:-([a-zA-Z0-9]+))?$')

def validate_privacy_policy_version_identifier(value: str) -> bool:
    return bool(privacy_policy_version_identifier_pattern.fullmatch(value))

# Example
print(validate_privacy_policy_version_identifier("v1.0"))  # True

Test Cases

When to use this pattern

This pattern is drawn from the Identity & PII > Consent & Compliance 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

Capture groups: 1=major, 2=minor, 3=patch, 4=label (e.g., 'gdpr', 'ccpa'). Store the version of the privacy policy that was in effect when each user's consent was collected. Consent tied to a specific policy version — material changes may require re-consent.