How to force nginx to redirect without inserting a slash before the extension?

Question

Nginx

There is a rule in which nginx redirects all requests of the form site.ru/catalog/aloha to site.ru/catalog/aloha.html

location ~ ^/catalog/([^\.]+)$ { return http://site.ru/catalog/$1.html; }

But it works correctly only when there is no slash at the end of the URL

Answer 1

location ~ ^/catalog/([^\.\/]+)/?$ {
    return http://site.ru/catalog/$1.html;
}

Replaces site.ru/catalog/aloha with site.ru/catalog/aloha.html
and site.ru/catalog/aloha/ with site.ru/catalog/aloha.html