请教一个Nginx实现二级域名rewrite的问题

CODE:

RewriteCond %{HTTP_HOST} ^(.*).www2.test.com$
RewriteRule ^/(.*)$ /%{SERVER_NAME}/$1
RewriteRule ^/(.*).www2.test.com[/]?$ /index.php?c=myspace&d=space&domain_name=$1 [L]

CODE:

if ($host ~* ^(.*)\.www2\.test\.com$) {
rewrite ^/(.*)$      /$server_name/$1;
rewrite ^/(.*).www2.test.com[/]?$        /index.php?c=myspace&d=space&domain_name=$1 last;
}