check out this Interpolation module from M-J. Dominus:
http://www.plover.com/~mjd/perl/Interpolation/
i haven't checked it out myself, but it looks pretty
interesting from just looking at the web page.
i don't think that there is a simple, transparent syntax
or function for doing what you want in Perl. at the least,
you can check out the techniques MJD uses in his Interpolation
module and go from there.
most of the time, i use (s)printf for such things, but
it does not have the nice feature of explicitly tying the
name to the postition as does symbolic variable
interpolation (i.e. it's hard to tell which '%s' goes with
which variable when there are twenty of them; 'Hello
$Recipient' is transparent).
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