[exim] REGEX question - what variable contains matched test

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Lähettäjä: Marc Perkel
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Aihe: [exim] REGEX question - what variable contains matched test
I'm using an ACL to match text within a message and I want to log the
part of the text string that constituted the match. How do I do that? Is
there a variable that contains matched text?

Thanks in Advance.