Capture MATCH?

Hello all:

I want to grab some incoming mail, add a header if a condition is met, then 
forward it to an internal exchange server.  I can do this if I put in a 
recipe for each user, but would like to just have one rule that captures 
the user name.  Below is what I have been working on.  The problems with 
this are:
1.  obviously I can not do a variable assignment inside of a 
recipe........should I write a scribe that would assign the variable and 
pipe it through it......any other ideas?
2.  my first \/ is grabbing everything after "To: " and not stopping at the 
@ sign, so even if I could capture it, it still contains the wrong data.
:0BH
 * ^To: \/(_dot_)*(_at_)externalserver(_dot_)mysite(_dot_)org
 USER=$MATCH
 * ^Content-(Type|Disposition):.*name=.*\.\/(exe|com|zip|vbs|shs|hta|scr|chm)
 {
        :0f
        | formail -I "X-VIRUSWARNING: This file had a $MATCH attachment"
        ! $USER(_at_)internalserver(_dot_)mysite(_dot_)org
 }


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