How can you weed out left referrers?

Question

Nginx

What regular expression can be made for such a purpose?

if ($http_referer != "example.com") {
return 403;
}

This doesn't work because the referrer also contains http
How can I make sure that only the content of the domain in the referrer is checked?

Answer 1

nginx.org/en/docs/http/ngx_http_referer_module.html
ngx_http_referer_module