Bar Admission Number (Attorney) Regex for PHP
/^[0-9A-Z]{4,10}$/What this pattern does
This page provides a lightweight, single-purpose regular expression for matching bar admission number (attorney), ported and verified for PHP. Identity and credential patterns need both correctness and safety, since they're frequent targets for adversarial input. The snippet below is ready to drop into your PHP project — whether you're validating in a Laravel validator, a WordPress plugin, or a standalone PHP script.
Php Implementation
<?php
// Bar Admission Number (Attorney)
// ReDoS-safe | RegexVault — Identity & PII > Professional Identity
define('BAR_ADMISSION_NUMBER_ATTORNEY_PATTERN', '/^[0-9A-Z]{4,10}$/');
function validate_bar_admission_number_attorney(string $input): bool {
return (bool) preg_match(BAR_ADMISSION_NUMBER_ATTORNEY_PATTERN, $input);
}
// Example
var_dump(validate_bar_admission_number_attorney("12345")); // bool(true)Test Cases
Matches (Valid) | Rejects (Invalid) |
|---|---|
12345 | 123 |
1234567890 | 12345678901 |
A12345 | 12-345 |
ABCD1234 | 1234 5678 |
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 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
US attorney bar numbers are generally public records — most state bars publish them for verification. However, combining bar number with other personal data creates a more detailed profile.
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.
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