Nginx rewrite nginx conf

Hi all
i need help.

i need rewrite this config to nginx, i tried but getting error a lot by nginx -t cmd:

location ~ ^([^.\?]*[^/])$ {
try_files $uri @addslash;
}

location @addslash {
return 301 $uri/;
}

location /admin {
try_files $uri $uri/ /admin/index.php?$query_string;

}

location / {
try_files $uri $uri/ /index.php?$query_string;

}
anyone can help me insert this code to rewrite rule please

 

Thank you so much Eva, i think it fixed. Because i insert nginx conf to domain.conf and getting error then i tried insert to staticfiles.conf and it working like a charm without any problem

Code:

nano /usr/local/nginx/conf/staticfiles.conf