.htaccess - htaccess 301 redirect folder, but not subfolders

Question

I need to redirect from:

http://example.com/folder

to http://example.com/newfolder

But leave:

http://example.com/folder/subfolder

Where it is. Is this possible? I can't seem to make it happen without causing a heap of redirect chaos.

Answer 1

Jestep's answer above redirects "/root-directory" but fails to redirect "/root-directory/". This can be fixed and simplified by simply:

RewriteCond %{REQUEST_URI} ^/folder/?$
RewriteRule (.*) /newfolder [R=301,L]

This will redirect "/folder" and "/folder/" but leave all sub-directories alone.