Crypto Transaction Hash (Generic) Regex for JavaScript

What this pattern does

This page provides a lightweight, single-purpose regular expression for matching crypto transaction hash (generic), ported and verified for JavaScript. Financial data validation has zero tolerance for false negatives — a missed invalid entry can corrupt downstream calculations. 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

// Crypto Transaction Hash (Generic)
// ReDoS-safe | RegexVault — Finance > Crypto

const cryptoTransactionHashGenericRegex = /^(?:0x)?[0-9a-fA-F]{64}$/;

function validateCryptoTransactionHashGeneric(input: string): boolean {
  return cryptoTransactionHashGenericRegex.test(input);
}

// Example
console.log(validateCryptoTransactionHashGeneric("0xabcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789")); // true

Test Cases

When to use this pattern

This pattern is drawn from the Finance > Crypto 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

Ethereum transactions use the 0x prefix. Bitcoin transactions do not. Both produce 256-bit (64 hex chars) hashes. Solana uses Base58-encoded 64-byte hashes — use a different pattern for Solana txids.