How I can redirect all pages of a folder to a certain page, using htaccess file?

I had a gallery folder. Then I have deleted it. However all pages under it are still shown as "unable to find" under Google Web开发者_Go百科masters tools. I want to redirect all pages of that folder to a certain page. How should I do it?

This will redirect all http://host/directory/anypage.html to http://host/somepage.html

RewriteEngine On
RewriteBase /
RewriteRule ^directory/.+\.html$ somepage.html