.htaccess 301 redirect

Hello,

How can I do a Mod Rewrite 301 redirect in the following cases?

Thank you in advance for your help.

http://www.example.com/folder1/index.php
http://www.example.com/folder1/index.php/
to
http://www.example.com/folder1/

http://www.example.com/folder2/index.php
http://www.example.com/folder2/index.php/
to
http://www.example.com/folder2/

It should be fairly straightforward. What have you tried so far?

I haven't tried anything yet. I didn't say that.

I want do a Mod Rewrite 301 redirect so this
http://www.example.com/folder1/index.php

will go to this
http://www.example.com/folder1/

Thank you.