nginx根据手机访问终端跳转不同页面

在nginx代码中做一下修改，根据不同的终端跳转到不同的页面。如下所示：

server {
 server_name g3.tm-sp.com;
 listen 80;
 access_log off;
 location / {
 if ($http_user_agent ~ "((MIDP)|(WAP)|(UP.Browser)|(Smartphone)|(Obigo)|(Mobile)|(AU.Browser)|(wxd.Mms)|(WxdB.Browser)|(CLDC)|(UP.Link)|(KM.Browser)|(UCWEB)|(SEMC\-Browser)|(Mini)|(Symbian)|(Palm)|(Nokia)|(Panasonic)|(MOT)|(SonyEricsson)|(NEC)|(Alcatel)|(Ericsson)|(BENQ)|(BenQ)|(Amoisonic)|(Amoi)|(Capitel)|(PHILIPS)|(SAMSUNG)|(Lenovo)|(Mitsu)|(Motorola)|(SHARP)|(WAPPER)|(LG)|(EG900)|(CECT)|(Compal)|(kejian)|(Bird)|(BIRD)|(G900/V1.0)|(Arima)|(CTL)|(TDG)|(Daxian)|(DAXIAN)|(DBTEL)|(Eastcom)|(EASTCOM)|(PANTECH)|(Dopod)|(Haier)|(HAIER)|(KONKA)|(KEJIAN)|(LENOVO)|(Soutec)|(SOUTEC)|(SAGEM)|(SEC)|(SED)|(EMOL)|(INNO55)|(ZTE)|(iPhone)|(Android)|(Windows CE)|(Wget)|(Java)|(curl)|(Opera))"){
        rewrite ^/(.*)$ http://www.ymgod.com/$1 ;
}
if ( $http_user_agent ~ ^$ )  {  
        rewrite ^/(.*)$ http://www.ymgod.com/$1 ;  
}         
 proxy_pass http://www.shangyutech.com;
 }
}