Remove everything in the request after ***.html excluding /amp/ via htaccess, how to do it?

Question

htaccess

I found this code for cutting off all characters after .html in the link

RewriteEngine On
RewriteRule (.+?)\.html.+$ https://%{HTTP_HOST}/$1.html [L,R=301]

It does what it needs to do without affecting links like ...***.html?123 which is great. But there are more links on the site ...***.html/amp/
What should be the htaccess code to exclude clipping in the presence of /amp/

Answer 1

RewriteRule ^(.+?)\.html(?!/amp/).+$ https://%{HTTP_HOST}/$1.html [L,R=301]