Domain dependent web root directory in #nginx. Need version 0.7.40

gistfile1.txt

server {
        listen   80; ## listen for ipv4
        # if we have www.miao.bau then the variables defined from
        # the regex are $1 = www and $2 = miao.bau
        server_name  localhost ~^(www\.)?(.+)$;

        access_log  /var/log/nginx/localhost.access.log;

        location / {
                root   /var/www/$2;
                index  index.html index.htm;
        }
}