nginx下面CodeIgniter rewrite规则

server{
listen 80;
server_name dev.xxx.bigoedu.com;
root /mnt/share/xxx.com/mfxxapi;
index index.php;
location ~ .*.php?$ {
fastcgi_pass 127.0.0.1:9000;
fastcgi_index index.php;
include fastcgi.conf;
index index.php index.html;
}
if (!-e $request_filename) {
rewrite ^/(.*)$ /index.php?s=$1 last;
}
}