Well, the hard part is behind us, we have successfully moved a rather larger and over-complicated multi-site setup with buddypress. Now we've got the old domain that we need to redirect.
We're doing a simple 301 redirect on the main site now, but I also want to map the subdomains to their new subdomains under the new domain.
ie: sd1.olddomain.com should resolve to sb1.newdomain.com. Right now the regex is just catching the root domain and properly redirecting all traffic, including the subdomains, to the root of newdomain.
I was thinking something like (.*).olddomain.com http://$1.newdomain.com would work but no such luck. Any regex/htaccess geniuses out there?