Bitcoin Bech32 Address (Native SegWit — bc1) Regex for JavaScript

What this pattern does

This page provides a lightweight, single-purpose regular expression for matching bitcoin bech32 address (native segwit — bc1), 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

// Bitcoin Bech32 Address (Native SegWit — bc1)
// ReDoS-safe | RegexVault — Finance > Crypto

const bitcoinBech32AddressNativeSegwitBc1Regex = /^bc1[ac-hj-np-z02-9]{11,71}$/;

function validateBitcoinBech32AddressNativeSegwitBc1(input: string): boolean {
  return bitcoinBech32AddressNativeSegwitBc1Regex.test(input);
}

// Example
console.log(validateBitcoinBech32AddressNativeSegwitBc1("bc1qar0srrr7xfkvy5l643lydnw9re59gtzzwf5mdq")); // 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

Bech32 uses the charset qpzry9x8gf2tvdw0s3jn54khce6mua7l. P2WPKH: bc1q + 39 chars (42 total). P2WSH: bc1q + 59 chars (62 total). Taproot (P2TR): bc1p + 58 chars. Case-insensitive but conventionally lowercase.