Rewrite only if first part is not an existing directory

[Berre]

My root directory (in the actual file system) has several subdirectories, one of which is a "main" site, while the others are individual user sites. Every subdirectory has their own .htaccess file, but it's the root .htaccess file that is the topic. I have tried to create rewrite rules myself, but I can't get the rewrite conditions to properly check for the folder existing.

 

/main/lots-of-files

/homer/lots-of-files

/marge/lots-of-files

/bart/lots-of-files

/lisa/lots-of-files

/maggie/lots-of-files

/.htaccess

 

So this is the root of my web server. When I go to sites.example.com I see the directory listing above. I want sites.example.com to point to "/main/" instead of "/". Not only that, but I want everything not specifically pointing to any user dubdirectory to rewrite to /main/.

 

These should not rewrite to /main/, because these directories exists in root*:

/homer/index.php

/marge

/lisa/pictures/profile.gif

 

* The files may not exist in those positions, as /homer/, /marge/, /bart/, /lisa/ and /maggie/ all has a .htaccess file with their own rewrite rules.

 

These should rewrite to /main/:

/

/philip

/bender/bending/rodriguez.php

/basically/anything-not-existing-as-a-directory

/some-file.txt

[CroNiX]

Maybe these would be useful in your htaccess

#If the request is not an actual existing file

RewriteCond %{REQUEST_FILENAME} !-f


#If the request is not an actual existing directory

RewriteCond %{REQUEST_FILENAME} !-d 

RewriteRule //Your rewrite rule

[Berre]

Ok. Thanks. I got it to work now. I've attempted using those conditions multiple times, but there seems to have been some issues with caching.