rewrite ^/admin$ /?s=admin last;
error_page 404 /404.html;
error_page 500 502 503 504 /50x.html;

location ~* "^/404/$" {
  try_files $uri $uri/ /index.php?s=index&m=page404;
}
location ~* "^/(\w+)/(\w+)/(\w+)/(.*)$" {
  try_files $uri $uri/ /index.php?s=$1&m=$2&c=$3&$args;
}
location ~* "^/(\w+)/(\w+)/(\w+)/$" {
  try_files $uri $uri/ /index.php?s=$1&m=$2&c=$3;
}
location ~* "^/(\w+)/(\w+)/(.*)$" {
  try_files $uri $uri/ /index.php?s=$1&m=$2&$args;
}
location ~* "^/(\w+)/(\w+)/$" {
  try_files $uri $uri/ /index.php?s=$1&m=$2;
}
location ~* "^/(\w+)/(.*)$" {
  try_files $uri $uri/ /index.php?s=index&m=$1&$args;
}
location ~* "^/(\w+)/$" {
  try_files $uri $uri/ /index.php?s=index&m=$1;
}