[ale] replacing text

[groups at ChangingLINKS.com (ChangingLINKS.com)]

I am trying to replace text in a set of files.
Thusly:  perl -pi -e "s/test/tEst/g;" ./*
Worketh.

However, I need to replace variables marked with $
Thusly: perl -pi -e "s/$test/$tEst/g;" ./*
Not worketh, nor  perl -pi -e "s/\$test/\$tEst/g;" ./*

How do I "escape" the $ ? 
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