Okay... so we want to find the left-most directory name which contains a dot... will that do it?
This RE will do it:
"^/(?:[^\./]+/)+([^\./]+\.[^/]+)/(?:[^/]+/)+/?$"
Translation:
^/ - To match, a $HOME directory must start with a /
(?:[^\./]+/)+ - Then there must be at least one directory level without a dot in it
([^\./]+\.[^/]+)/ - After one or more of those, there must be a directory level with a dot in it. This is what will be returned as the Domain.
(?:[^/]+/)+ - Then there must be at least one directory level after that, which may or may not contain a dot.
/?$ - Finally, the string may or may not end with /
That's my final answer. If that won't do, I may make it a ./configure-time option for all virtual user admins to set, with the above as default.
This will break any system with non-virtual users where a normal user's home directory path has a '.' in it somewhere. I don't know if that happens anywhere.
-- Jim Ramsay "Me fail English? That's unpossible!"
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