private static function normalize($cn)
{
$cn_orig = $cn;
$regex_alpha = "([A-Z]{1,3})";
$regex_num = "([0-9]{0,4})";
$regex_extra = "([ ]?\\.[A-Z0-9][0-9]*)";
$regex = "/^{$regex_alpha}{$regex_num}?{$regex_extra}?/";
$matches = array();
if (preg_match($regex, $cn, $matches)) {
//normalize alpha
$alpha = $matches[1];
//.\util\Utility::ntimes('*',3-strlen($matches[1]));
//normalize num
if (array_key_exists(2, $matches)) {
$num = $matches[2] . \util\Utility::ntimes('*', 4 - strlen($matches[2]));
} else {
$num = "****";
}
//normalize extra
if (array_key_exists(3, $matches)) {
$extra_match = array();
if (preg_match("/([A-Z])/", $matches[3], $extra_match)) {
$ch = $extra_match[0];
$i = 2;
} else {
$ch = '*';
$i = 1;
}
$extra = $ch . substr($matches[3], $i);
} else {
$extra = "";
}
return str_split($alpha . $num . $extra);
}
error_log("failed to normalize: {$cn_orig}");
return;
}
