Git Commit Hash (SHA-256, New Format) Regex for Python

What this pattern does

This page provides a lightweight, single-purpose regular expression for matching git commit hash (sha-256, new format), 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

# Git Commit Hash (SHA-256, New Format)
# ReDoS-safe | RegexVault — Dev & Systems > Git

import re

git_commit_hash_sha256_new_format_pattern = re.compile(r'^[0-9a-fA-F]{64}$')

def validate_git_commit_hash_sha256_new_format(value: str) -> bool:
    return bool(git_commit_hash_sha256_new_format_pattern.fullmatch(value))

# Example
print(validate_git_commit_hash_sha256_new_format("e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855"))  # True

Test Cases

When to use this pattern

This pattern is drawn from the Dev & Systems > Git 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

Git SHA-256 (Object Format Version 1) was introduced experimentally. SHA-256 repositories are not yet fully interoperable with SHA-1 repositories as of 2026.