How to write a regular expression with domain variation?

Question

Nginx

Good evening.
You need to specify allowed domains where only login https://*.domain.ru will change

add_header 'Access-Control-Allow-Origin' 'https://login.domain.ru';

This option is not entirely suitable, as it requires placement in location. And you need to register outside all locations add_header 'Access-Control-Allow-Origin' ''

if ($http_origin ~* "^https?://[^/]+\.domain\.ru$" ) {
        add_header Access-Control-Allow-Origin $http_origin;
      }