nginx: redirect mobile requests to /mobile/$uri

Question

I am trying to setup my nginx to redirect all the requests from mobile devices to /mobile/$uri i came up with this solution but it doesn\'t seem to work. Is it a syntax problem

Answer 1

    #initliaze mobile
    set $mobile "";

    if ($request_uri !~* "^/mobile.*" ){
        set $mobile Y;
    }
    if ($http_user_agent ~* (iPhone|iPod|android|blackberry) ) {
        set $mobile "${mobile}E";
    }

    if ( $http_referer !~* "xxx\.org" ){
       set $mobile "${mobile}S";
    }

    if ( $host ~* "xxx\.org" ){
       set $mobile "${mobile}S";
    }

    if ($mobile = YESS){
        rewrite ^ $scheme://$host/mobile$request_uri ;
    }