301 redirect for WP Permalink Structure?

[bryanw]

Hello,

My original setting is /%category%/%postname%/, and the post url likes
www.domain.com/category_name/post_name/

New setting is /%category%/%postname%.html, and the post url likes www.domain.com/category_name/post_name.html

But I have build some links for primary setting.

Can htaccess setting bulk redirect www.domain.com/category_name/post_name/ to www.domain.com/category_name/post_name.html?

Thanks!

[bryanw]

Because there a huge amount of posts, so I can't redirect each post solely.