Why is the rewrite not working?

Question

Apache HTTP Server

RewriteCond %{REQUEST_URI} ^/catalog/$ [NC]
  RewriteRule ^(.*)$ /catalog/all/ [NC]

I expect /catalog/ to be rewritten to /catalog/all/ but it doesn't.
Why?

Answer 1

RewriteRule ^catalog/$ /catalog/all? [L,R=301]