What do these redirects mean in Nginx?

Question

Nginx

Help define what each rewrite/redirect means.

rewrite ^/(.*)/$ /$1 permanent;

if ($request_uri ~* "\/\/") {       rewrite ^/(.*)      $scheme://$host/$1    permanent;     }

rewrite ^/(.*)\.html /$1/ permanent;

if ($request_uri ~* "^(.*/)index\.php$") {
    return 301 $1;
}

if ($request_uri ~* "^(.*/)index\.php(/?)(.*)") {
        return 301 $1$3;
    }

Answer 1

So here it is in detail. We must try to understand how it works, and not stupidly memorize.
ngx_http_rewrite_module
$request_uri