What way it is to be to get two GET methods in the URL by htaccess?
RewriteRule ^adm/(.*)$ adm.php?mode=$1
I\'ve used that for the example
Instead of writing complex regular expressions in the .htaccess, I would just use a simple
RewriteCond $1 !^adm\.php
RewriteRule ^adm/(.*)$ adm.php/$1 [L]
and work with $_SERVER['PHP_SELF'] inside adm.php so you can handle any kind of complex URL which starts with adm without changing the .htaccess.