以下是apache的形式,想换成nginx的rewite,请教各位大佬帮助，谢谢

RewriteEngine on
RewriteCond %{http_host} ^a.com [NC]
RewriteRule ^(.*)$ http://www.a.com$1 [R=301,L]

RewriteRule ^/track/(.*)$ /b/b/r.php?param=$1 [L]

RewriteCond  %{DOCUMENT_ROOT}%{REQUEST_URI} !-d
RewriteRule ^/((?!\.).)*(?<!\/)$      $0/ [R=301,L]

RewriteCond %{DOCUMENT_ROOT}%{REQUEST_URI} !-f
RewriteCond %{REQUEST_URI}   !^/(public|admin)/{0,1}
RewriteRule ^/  /index.php [L]

大佬来帮你了

location ~ ^/(public|admin)/\{0,1} {
  try_files $uri $uri/ /index.php?$query_string;
}

location / {
  if ($http_host ~* "^a.com"){
    rewrite ^(.*)$ http://www.a.com$1 redirect;
  }
  rewrite ^/((?!.).)*(?<!/)$ /$arg_0/ redirect;
}

location /track {
  rewrite ^/track/(.*)$ /b/b/r.php?param=$1 break;
}

@Albert
多谢回答，但好像不能用

location ~ ^/(public|admin)/{0,1}" {
try_files $uri $uri/ /index.php?$query_string;
}
这个双引号是什么意思？

location ~ ^/(public|admin)/\{0,1} {
  try_files $uri $uri/ /index.php?$query_string;
}

location / {
  if ($http_host ~* "^a.com"){
    rewrite ^(.*)$ http://www.a.com$1 redirect;
  }
  rewrite ^/((?!.).)*(?<!/)$ /$arg_0/ redirect;
}

location /track {
  rewrite ^/track/(.*)$ /b/b/r.php?param=$1 break;
}

htaccess to nginx converter