stripping www from URL with .htaccess

[Jeru]

I would like to redirect all users to https. This works fine with this code.

RewriteEngine On
RewriteCond %{HTTPS} off
RewriteRule (.*) https://%{HTTP_HOST}%{REQUEST_URI}
# redirect if it looks like this https://domain.com/svrduzx8xCupDgJHpOdq 
RewriteCond %{REQUEST_FILENAME} -f [OR]
RewriteCond %{REQUEST_FILENAME} -d
RewriteRule ^.* - [L]
RewriteBase /
RewriteRule ^([a-zA-Z0-9]+)$ https://%{HTTP_HOST}/application.php?i=$1

But the problem is that some users still type www, resulting in https://www.domain.com. This gives a ssl cert error.
So I would like to first strip the www before redirecting to https. I've tried different approaches, such as:

# remove www from host
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{HTTP_HOST} ^www\.domain\.com$ [NC]
RewriteRule ^(.*)$ http://domain.com/$1 [L,R=301]

But I can't get it to work. .htaccess is pretty new to me, anyone with experience who knows how to get this done (properly)?

[abduraooft]

Try

RewriteCond %{HTTP_HOST} ^www\.(.+)$ [NC]
RewriteRule ^(.*)$ https://%1/$1 [R=301,L]

[Jeru]

Thanks abduraooft for your reply!
Your code works, but only for www.domain.com

It won't redirect https://www.domain.com
Any idea how to tackle this?