Redirecting existing links to a sub-folder to a new subdomain

[codecowboy]

If I want to transform links from
http://exampledomain.com/sub-folder/some-article to
http://subdomain.exampledomain.com/some-article where subdomain has the same
name as the subfolder, do I need a rewrite or a redirect? I *think* I need a
redirect but want to be sure I am doing it the recommended way.

I tried "rewrite /sub-folder-name/(.*)
$scheme://sub-folder-name.exampledomain.com/$1 permanent;"

But this didn't seem to have any effect after restarting nginx.

Thanks!

Posted at Nginx Forum: http://forum.nginx.org/read.php?2,256869,256869#msg-256869