Libyan National Number Regex

nid_regex.php

<?php
/**
 * Total Length: 12 digits
 * [1][2002][0012345]
 * |    |      |
 * |    |       -> Random: 7 digits
 * |     -> Birth Year: 4 digits
 *  -> Gender 1 male / 2 female: 1 digit
 */

$value = '120020012345';

//from 1900 - 2099
$pattern = '/^(1|2)(19|20)[0-9]{2}[0-9]{7}$/';
if (preg_match($pattern, $value)) {
    echo 'Valid NID Number';  
} else {
    echo 'Invalid NID Number';
}