URL rewrite Why is it wrong?

URL rewrite Why is it wrong?

Rewriteengine on
Rewritebase/forum
Rewriterule ^ (index| List| content|admin| vote| message| Favor). *) $ index.php/$1


Tips
Not Found

The requested url/forum/list-index-f-2.shtml is not found on this server.

Additionally, a 404 Not Found error is encountered while trying to use an errordocument to handle the request.

But I wrote
Rewriterule 1.php 2.php is right, it's confusing.

------Solution--------------------
Make sure the rewritebase path is correct.

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