The "^/$" came from :

#to detect if the device with www entered in domain is mobile
if ($http_user_agent ~* '(iPhone|iPod|iPad|Android|BlackBerry|webOS|Windows
Phone)') {
  rewrite ^/$ http://m.domain.com$request_uri;
}

Posted at Nginx Forum: 
http://forum.nginx.org/read.php?2,260033,260097#msg-260097

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