.htaccess newbie issue using mod_rewrite

I need to create SEO-friendly urls for my site. I found out I can use .htaccess to rewrite them. So I tried this:

> http://www.domain.com/page/1/mypage

> http://www.domain.com/user/2/myuser

> http://www.domain.com/help/3/myhelp

Now I am stuck with a common rule and I don't understand Ant to redirect traffic based on the name of the page:

I use:

RewriteEngine ON

RewriteRule ^(.*)$ page.php?page=$1

Then in my PHP I don't get the page correctly, I get the file which is wrong.

How can I fix this?

Source: Tips4all