preg_match a specific timestamp

Alright everyone,

So I'm stuck on the one, especially because I've never really took the time to learn regex's correctly, but here's my problem if anyone's willing to help.

2011-03-04T18:40:12-05:00

The above line is the kind of line I want to find with preg_match(), this is what I tried (among many variations of it for the past 45 minutes)

$tests['xmls_ts'] = "2011-03-04T18:40:12-05:00";
//$xmls_pattern = "/([0-9]{4})-([0-9]{2})-([0-9]{2})T([0-9]{2})[0-9]{2})\[0-9]{2})\[0-9]{2})-([0-9]{2})\[0-9]{2})/";
$xmls_pattern = "/(d{4})-(d{2})-(d{2})T(d{2}{2}{2}-d{2}{2})/";
$fd = preg_match($xmls_pattern,$tests['xmls_ts'],$matches); 
if($fd) { echo 'yes'; }
else { echo 'no'; }

Can anyone tell me where I'm going wrong?

The d's need to be escaped so that they mean decimal digits rather than the letter d -

$xmls_pattern = "/(\d{4})-(\d{2})-(\d{2})T(\d{2}:\d{2}:\d{2}-\d{2}:\d{2})/";

Wow, it's works... thanks so much!

The d's need to be escaped so that they mean decimal digits rather than the letter d -

$xmls_pattern = "/(\d{4})-(\d{2})-(\d{2})T(\d{2}:\d{2}:\d{2}-\d{2}:\d{2})/";