regexp problem in grabbing link url

Hi.
So i have to grab a cetain part from a link.

Here is my example:

so I want to grabb the red text using preg_match function.

My problem is that i don't know how to put the condition if &y=23 exists or not.

please help

Thank you

 

How about:

preg_match('/<a href="somepage.cgi?x=([^&"]+)/i', ...

Code (markup):

 

Thanks . That is great