Apache Mod_Rewrite Help

I'm trying to convert a subdirectory to a variable for use in a query.

e.g.

domain/subdir/STRING (Need the "STRING" subdir)

converted to:

domain/subdir/index.php?q=STRING

All I'm getting are Internal Server Errors and 404's and the phpinfo() for some odd reason.

P.S.

Tried the info on this page already: http://corz.org/serv/tricks/htaccess2.php

EDIT:

This appears to be working. RewriteRule ^([a-zA-Z0-9]+)$ index.php?qst=$1

But it limits the match to AlphaNum characters and I would like to in开发者_StackOverflow中文版lcude, -, _ and the # if it's possible.

RewriteRule ^subdir/index\.php(.*) - [L]
RewriteRule ^subdir/(.*)$ /subdir/index.php?q=$1 [L]

RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule ^subdir/(.*)$ /subdir/index.php?q=$1

The RewriteCond checks if the requested document isn't an existing file, that way we don't get a recursive call for index.php

The next rule is a common rewrite to request /subdir/index.php.