How to make a redirect when changing the structure of the URL?

Question

htaccess

Hello.
Changed the structure of permalinks in wordpress.
Tell me how to make a 301 redirect in .htaccess
Old url structure: /%year%/%monthnum%/%day%/%postname%/
New url structure: /%postname%.html
Thank you very much in advance for your answer!)

Answer 1

Solved with plugin: Change Permalink Helper