Rewrite but not normal?

Question

CodeIgniter

Good afternoon.
There is a need to implement such functionality on CodeIgniter
Imagine there is a controller - partner

class Partner extends CI_Controller {<br>
function page($partnerName,$method = 'main'){<br>
echo $this->$method($partnerName);<br>
}<br><br>
function main($partnerName){<br>
//выводит view<br>
}<br><br>
function contacts($partnerName){<br>
//выводит view<br>
}<br><br>
}<br>

As a result, the following links are obtained:
site.com/partner/page/PartnerName/
site.com/partner/page/PartnerName/contacts/
and the like
Question. How to correctly write the setting in rewrite nginx to get this:
partnerName.site.com/
partnerName.site.com/contacts/
I would be very grateful.

Answer 1

try like this:
server {
server_name ~^(www\.)?(?<PARTNER>.+)\.site\.com$;
rewrite ^/(.*)$ http\://site\.com/partner/page/$PARTNER/$1 last;
return 403;
}

Answer 2

Isn't it easier to define this in application/config/routes.php ?