Stop expanding variables

I need a variable which consists of the following string:

'$(Configuration)|$(Platform)' == 'Release|AnyCPU'

however, when I try to use it, FB5 is trying to expand the $().

How can I prevent the expansion from occuring.   All I can find the documentation is the % for the % escape character.

 

Prefix the $( with another $, e.g : $$(Configuration)|$$(Platform)