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

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 JavaScript. A rigorously tested regex reduces debugging time and protects your application from edge-case failures. The snippet below is ready to drop into your JavaScript project — whether you're validating in an Express middleware, a Next.js API route, or a client-side form.

Javascript Implementation

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

const gitCommitHashSha256NewFormatRegex = /^[0-9a-fA-F]{64}$/;

function validateGitCommitHashSha256NewFormat(input: string): boolean {
  return gitCommitHashSha256NewFormatRegex.test(input);
}

// Example
console.log(validateGitCommitHashSha256NewFormat("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 JavaScript developers because especially critical in long-running Node.js event loops where a ReDoS vulnerability can block the entire process. 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.