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

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 Python. 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 Python project — whether you're validating in a Django view, a FastAPI endpoint, or a standalone data processing script.

Python Implementation

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

import re

bitcoin_bech32_address_native_segwit_bc1_pattern = re.compile(r'^bc1[ac-hj-np-z02-9]{11,71}$')

def validate_bitcoin_bech32_address_native_segwit_bc1(value: str) -> bool:
    return bool(bitcoin_bech32_address_native_segwit_bc1_pattern.fullmatch(value))

# Example
print(validate_bitcoin_bech32_address_native_segwit_bc1("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 Python developers because particularly important in Python web servers where CPU-bound regex operations can stall concurrent request handling. 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.