Capture match to variable?

Hello all:

I want to insert a custom header based on what was matched in a regexp, so 
I can have the header include why mail was bounced or re-routed.  Here is a 
very basic example:
:0H
 * Subject.*(MAILTEST|FUNTIME)
 {
        :0f
        | formail -I "TEST: Found test header $1"
 }      

In the regexp that I am familiar with, (MAILTEST|FUNTIME) in parens would 
record whatever it matched into /1 or $1.  This seems to not work in this 
case or the state of the recording is passed when it gets to the 
action.  Is there a work around to capture the matched text to a variable?
What I really want to do is something like this:

:0BH
 * ^Content-(Type|Disposition):.*name=.*\.(exe|com|zip|vbs|shs|hta|scr|chm)
  *! ^From(_dot_)*knowngoodaddress(_at_)mydomain(_dot_)com
 {
        :0f
          | formail -I "X-VIRUSWARNING: This file had a $2 attachment"
        :0:
        ! suspectfiles(_at_)mydomain(_dot_)com
 }

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