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

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 PHP. 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 PHP project — whether you're validating in a Laravel validator, a WordPress plugin, or a standalone PHP script.

Php Implementation

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

define('BITCOIN_BECH32_ADDRESS_NATIVE_SEGWIT_BC1_PATTERN', '/^bc1[ac-hj-np-z02-9]{11,71}$/');

function validate_bitcoin_bech32_address_native_segwit_bc1(string $input): bool {
    return (bool) preg_match(BITCOIN_BECH32_ADDRESS_NATIVE_SEGWIT_BC1_PATTERN, $input);
}

// Example
var_dump(validate_bitcoin_bech32_address_native_segwit_bc1("bc1qar0srrr7xfkvy5l643lydnw9re59gtzzwf5mdq")); // bool(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 PHP developers because especially relevant in PHP where PCRE backtracking limits can trigger silent failures on malicious input. 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.