How can nginx extract the substring from a URL?

To extract a substring from a URL, you can utilize Nginx’s built-in variables and string processing functions. Here are some commonly used methods:

1. Get URL parameters using the $arg_ variable.
2. location / {
   if the parameter “param” exists in the URL, set it as a variable named “param”.
   }
3. Implement string mapping using the ngx_http_map_module module.
4. http {
   map $request_uri $substring {
   # Extract specified substring from the URL
   “~^/path/(?.+)$” $substring;
   }
   }

   server {
   location / {
   # Use the $substring variable
   echo $substring;
   }
   }

5. Match and extract strings in a URL using regular expressions.
6. Match the regular expression to extract the string from the URL in the location “/path/”. Set the extracted string as $substring.

Please note that these methods need to be adjusted according to specific needs and URL structures to meet actual extraction requirements.