Dynamic mod rewrite possible?

mod_rewrite in htaccess

[phyle]

Hi all,
(Firs time here ...sorry for any mistakes.).

RewriteRule ^content\/id\/([0-9a-z-]+).html$ index.php?catalog=$1 [L]

Is it possible to have "$id" in the place of "id" ?

"$id" is from a php script to create dynamic folder when user uploads.

[g1smd]

The RewriteRule pattern deals with the incoming request from the user; in this case with a literal 'id' in the URL. If it is a variable piece of data at that position, capture it in a backreference using a parenthesised pattern like ([^/]+) or similar. That variable must be passed to your script for checking and processing.