I'm trying to get the date until my account is invalid but all my code gets is the date, is there anything wrong with this code?

PHP Code:
ereg("Your Premium-Account is valid until ([a-zA-Z\_0-9\.,-]+)", $pagedata, $valid); 
What I'm tying to get is "Your Premium-Account is valid until Wed, 31. Oct 2007." And all my code gets is "Wed," Can anyone see what I'm doing wrong?