Ok, I finally got it working. Thanks to everyone for their help.
First off, I had to download four files and put them in my ~/Maildir/inc
rep.inc rep.inc.inc snr_fast.inc snr_fast.inc.inc
And here's the recipe I'm using:
* ^TO_ \/(_dot_)*(_at_)subdomain\(_dot_)domain\(_dot_)com
* MATCH ?? ()\/[^(_at_)]+
snr_String = $MATCH
snr_Search = "."
snr_Replace = "-"
INCLUDERC = inc/snr_fast.inc
I think this belongs in some kind of FAQ.
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