Advanced Controller Routing (based on domain)

[eluser]toopay[/eluser]
What about these :

Code:

RewriteEngine on
RewriteCond $1 !^(index\.php|assets|robots\.txt|user_guide)
RewriteCond %{HTTP_HOST} ^(www\.)?([^.]+)\.([^.:]+)
RewriteCond %{DOCUMENT_ROOT}application/modules/%1%2/ -d

RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d

RewriteRule (.*) index.php/%1%2/$1 [R=permanent,L]
# If above lines didnt works, swap it with these line...
# RewriteRule (.*) /index.php/%1%2/$1 [R=permanent,L]

With above regex, it will capture your exist domain (site1.com/foo or www.site1.com/foo) and after validate if the directory is valid(represented with DOCUMENT_ROOT) these should be redirect it into index.php/domain1.com/foo