regex usage

[Valedol <Valedol@xxxxxxx>]

Is there a mothod to check string`s length with regex or the only way is  
using strlen?

I want string consisting of 4 digits
and check string with this code:

if (preg_match("/\d{4}/",$_POST[id]))
{ echo $_POST[id]; }

but preg_match  returns true when string consists of 4 or more digits
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