Indian Date Format (DD-MM-YYYY with hyphen) Regex for Python

What this pattern does

This page provides a well-structured, multi-part regular expression for matching indian date format (dd-mm-yyyy with hyphen), 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 Date Format (DD-MM-YYYY with hyphen)
# ReDoS-safe | RegexVault — Localization > Date Formats

import re

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

def validate_indian_date_format_ddmmyyyy_with_hyphen(value: str) -> bool:
    return bool(indian_date_format_ddmmyyyy_with_hyphen_pattern.fullmatch(value))

# Example
print(validate_indian_date_format_ddmmyyyy_with_hyphen("15-01-2024"))  # True

Test Cases

When to use this pattern

This pattern is drawn from the Localization > Date Formats 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=day, 2=month, 3=year. India widely uses DD-MM-YYYY and DD/MM/YYYY interchangeably. Officially, India has adopted ISO 8601 for government communications since 2004, but the DD-MM-YYYY format persists widely.