Forum Moderators: phranque
RewriteCond %{THE_REQUEST} ^[A-Z]+\ /subfolderA(/[^\ ]*)?\ HTTP/
RewriteRule ^subfolderA(/(.*))?$ http://www.mydomain.com/subfolderA/subfolderB/$2 [R=301,L]
RewriteCond $2 !^/subfolderB/
RewriteRule ^subfolderA(/(.*))?$ http://www.mydomain.com/subfolderA/subfolderB/$2 [R=301,L]