Bar Admission Number (Attorney) Regex for Python

What this pattern does

This page provides a lightweight, single-purpose regular expression for matching bar admission number (attorney), ported and verified for Python. Identity and credential patterns need both correctness and safety, since they're frequent targets for adversarial input. 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

# Bar Admission Number (Attorney)
# ReDoS-safe | RegexVault — Identity & PII > Professional Identity

import re

bar_admission_number_attorney_pattern = re.compile(r'^[0-9A-Z]{4,10}$')

def validate_bar_admission_number_attorney(value: str) -> bool:
    return bool(bar_admission_number_attorney_pattern.fullmatch(value))

# Example
print(validate_bar_admission_number_attorney("12345"))  # True

Test Cases

When to use this pattern

This pattern is drawn from the Identity & PII > Professional Identity 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

Bar admission numbers (State Bar ID) vary by state: California uses 6 digits (100000-999999), New York uses 7 digits, Texas uses alphanumeric. The State Bar of each state maintains the public database of admitted attorneys.