If I try to delete wave slash from URL, /index answers 404 Not Found - nginx

Question

I'm working on a docker Nginx server on local, this is my conf.d/default.conf configuration:
server {
listen 80;
listen [::]:80;
server_name localhost;
return 301 https://$host$request_uri;
}
server {
listen 443 ssl;
server_name localhost;
ssl_certificate /etc/ssl/certs/localhost.pem;
ssl_certificate_key /etc/ssl/private/localhost.key;
root /usr/share/nginx/html;
index index.html index.htm;
location / {
try_files $uri $uri/ /index.html;
}
location ~ ^/~(.+?)(/.*)?$ {
alias /home/$1/public_html$2;
index index.html index.htm;
autoindex on;
}
}
This configuration works perfectly, but for last "location" block, which works as an "userDir" directive, I have to type an URL like this: https://localhost/~user1/
In order to remove that trailing slash, I tried:
location ~ ^/(.+?)(/.*)?$ {
alias /home/$1/public_html$2;
index index.html index.htm;
autoindex on;
}
This solution works fine and answers with the index.html content in "/home/user1/public_html" by using the URL https:/localhost/user1 which is how I want it to work, but then, root content (https:/localhost/) becomes 404 Not Found.
Hope I did explain it well and someone has a solution! Thank you in advance!!