Problem with eregi match

I am having a problem with eregi match with the following bit of code, by rights it should work and I guess i must be missing something here. Any help would be welcomed.

$cpfile = '<!-- basic shop coupon goes here (max width 600px)-->text<!-- End Body Table -->';
$string = '<!-- basic shop coupon goes here (max width 600px)-->(.*)<!-- End Body Table -->';
$items = eregi( $string, $cpfile, $cparray );

PHP:

Thanks

 

i found the problem it is with () use \(\)
ex:
$string = '<!-- basic shop coupon goes here \(max width 600px\)-->(.*)<!-- End Body Table -->';