RewriteCond %{request_uri} !^/subdomainler
RewriteCond %{HTTP_HOST} !^www\.site\.com[NC]
RewriteCond %{HTTP_HOST} ^([^.]+)\.site\.com
RewriteRule (.*) /subdomainler/%1/$1 [L]
RewriteCond %{THE_REQUEST} ^[A-Z]{3,9}\ /subdomainler/(.+)\ HTTP/
RewriteRule ^subdomainler/([^/]+)/(.*)$ http://$1.site.com/$2 [R=301,L]