I'll go ahead and clarify now.
Redirect is meant for matching URLs that begin with the same string. It is not designed to match a string exactly. For example your url-path is /something.htm and someone tries to visit /something.html - they will get redirected.
Obviously you need something that can match a string exactly. And that is where RedirectMatch comes in. You can use it to match URLs that begin and end with a certain string:
RedirectMatch ^/$ /forum/
Where the regular expression indicates we are looking for a URL that begins with a slash, contains only a slash, and ends with a slash.
So don't forget to bookmark Apache HTTP Server Documentation
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