[Exim] IF syntax - confused

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Author: Marc Perkel
Date:  
To: exim-users
Subject: [Exim] IF syntax - confused
OK - I'm confused about how to do the syntax on this.

I want to do an if conditional in a filter where I want to determine if
"string" is in a file that contains a list of prohibited email address -
like this:

savebig@*
joe@???

How do I write that conditional?