nginx subdomain rewrite - regex

Question

I need a nginx rewrite rule to rewrite from:
http://some-keyword.example.com to www.example.com/keyword.php?keyword=$some-keyword
while domain without www in front still rewrites to www.example.com and www isn't taken as a keyword.
Please could you help me to solve this problem, how to write these two rules?

Answer 1

If you meant redirect, then:
server {
server_name ~^(.*)\.example\.com$ ;
rewrite ^ http://www.example.com/keyword.php?keyword=$1 redirect;
}
In the case of rewrite then simply do
server {
server_name example.com ~^(.*)\.example\.com$ ;
rewrite ^ /keyword.php?keyword=$1 break;
# location /keyword.php {
# ....
# }
}

Answer 2

rewrite ^/list-c-([0-9]+)-k-(.+)-o-1\.html$ /index.php?module=Default&action=List&c=$1&k=$2&o=1 last;
rewrite ^/list-c-([0-9]+)-k-(.+)-o-1-p-(.+)\.html$ /index.php?module=Default&action=List&c=$1&k=$2&o=1&p=$3 last;
rewrite ^/list-c-([0-9]+)-k-(.+)-o-1-price-(.+)\.html$ /index.php?module=Default&action=List&c=$1&k=$2&o=1&price=$3 last;
rewrite ^/list-c-([0-9]+)-k-(.+)-o-(.+)-p-1\.html$ /index.php?module=Default&action=List&c=$1&k=$2&o=$3&p=1 last;
rewrite ^/list-c-([0-9]+)-k-(.+)-o-(.+)-p-(.+)\.html$ /index.php?module=Default&action=List&c=$1&k=$2&o=$3&p=$4 last;

Answer 3

If it's possible I'd only create 1 server(virtual host) which is the normal domain.com/www.domain.com and then use the conf to rewrite the rest to them
server {
server_name domain.com www.domain.com;
# normal handling for files
}
server {
server_name ~(?<subdomain>[^\.]*).domain.com;
location / {
try_files keyword.php?keyword=$subdomain =404;
}
}
please tell me if I missed something.