Syntax for Url Exception

I have 2 urls that I need to create exceptions for and are new to the syntax that is required; the urls are below:

http://*.mailshell.net/*
http://update.gfi.com/*

I tried this but there are still exceptions in the live log:

^http?://([A-Za-z0-9.-]*\.)?mailshell.net/*
^http?://([A-Za-z0-9.-]*\.)?update.gfi.com/*

Thanks