I am just putting some of my regular expressions here so that I can view it later.  So no one should care about this post at all! :)

In Visual Studio I needed to find every single line comment which also included the word IsNew in it.

^\s*//.*IsNew.*$

This will match from the beginning of the line (^) any whitespace characters (\s*) up to the comments (//). Then anything after the comments (.*) up to IsNew (IsNew) and after IsNew (.*) to the end of line ($).