sed style replacement in mailer.py's configuration file

Need some more Python fu.

I have 8 separate repositories, some of which are two words
concatenated together with a _, such as "acme_dynamite".

I have a Mailman mailing list named svn-acme-dynamite-checkins and
would like to use mailer.py's regular expression matching to use
"for_repos" to catch the repository name and create the mailing list
name from it.

Right now I can do this

to_addr = svn_%(repos)s_checkins@abc.com

and set up an /etc/alias from svn_acme_dynamite_checkins to
svn-acme-dynamite-checkins, but the mail archive and outgoing mail
will have an odd email address.

I could set up a separate section in mailer.conf for each repository,
but that wastes the regex capabilities of mailer.py.

Is there some easy way to have a s/_/-/ done on matching strings? Is
this built into Python's %(var)s that I could use without modifying
mailer.py?

Best,
Blair

--
Blair Zajac <blair@orcaware.com>
Plots of your system's performance - http://www.orcaware.com/orca/
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