.htaccess redirect all pages to new domain

Which redirect rule would I use to redirect all pages under olddomain.example to be redirected to newdomain.example?

The site has a totally different structure, so I want every page under the old domain to be redirected to the new domain index page.

I thought this would do (under olddomain.example base directory):

RewriteEngine On
RewriteRule ^(.*)$ http://newdomain.example/ [R=301]

But if I navigate to olddomain.example/somepage I get redirected to newdomain.example/somepage. I am expecting a redirect only to newdomain.example without the page suffix.

How do I keep the last part out?