htaccess redirect url with parameters

Question

I have hundreds of links like this:

http://www.domain.com/index.php?tag=value

I want to redirect all links to

http://www.domain.com/value/

Example:

Link1 http://www.domain.com/index.php?tag=LW1fdX49tR redirect to: http://www.domain.com/LW1fdX49tR/

Link2 http://www.domain.com/index.php?tag=A3kh0QLIrc redirect to: http://www.domain.com/A3kh0QLIrc/

Link3 http://www.domain.com/index.php?tag=vXwNR4U9qY redirect to: http://www.domain.com/vXwNR4U9qY/

etc

How can I do that? Thank you!