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

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 Java. 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 Java project — whether you're validating in a Spring Boot controller, a Jakarta EE service, or a standalone utility class.

Java Implementation

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

import java.util.regex.Pattern;

public class BitcoinBech32AddressNativeSegwitBc1Validator {
    private static final Pattern PATTERN =
        Pattern.compile("^bc1[ac-hj-np-z02-9]{11,71}$");

    public static boolean validate(String input) {
        return PATTERN.matcher(input).matches();
    }

    // Example
    public static void main(String[] args) {
        System.out.println(validate("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 Java developers because critical in Java applications since the JVM regex engine uses backtracking and is susceptible to ReDoS without careful pattern design. 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.