.htaccess subdomain traffic to folder and sub folders - .htaccess

Question

Ok long story short:
http://subdomain.domain.com/test1/test2
needs to display the information here:
http://domain.com/agents/subdomain/test1/test2
and obviously if you with this
http://subdomain.domain.com/
needs to display
http://domain.com/agents/subdomain/
Here's what I have so far:
RewriteEngine On
RewriteCond $1 !\.(gif|jpe?g|png)$ [NC]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.*)$ /index.php?/$1 [L]
RewriteCond %{HTTP_HOST} !^(www\.)?domain\.com [NC]
RewriteCond %{HTTP_HOST} ([^\.]+)\.domain\.com [NC]
RewriteCond %{REQUEST_URI} !^/agents
RewriteRule ^(.*)$ /agents/%1/$1/ [L]
I need the first rule to get rid of the index.php from the URL.
I can get the first piece done http://subdomain.domain.com/ but not the sub folders.
the above syntax is throwing an internal server error but if I change the last line to:
RewriteRule ^$ /agents/%1/$1/ [L]
it works except I can't get to sub directories.

Answer 1

Ok finally figured this out... here's the solution:
RewriteEngine On
RewriteCond $1 !\.(gif|jpe?g|png)$ [NC]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{HTTP_HOST} ^(www\.)? domain\.com [NC]
RewriteRule ^(.*)$ /index.php?/$1 [L]
RewriteCond %{HTTP_HOST} !^(www\.)? domain\.com [NC]
RewriteCond %{HTTP_HOST} ([^\.]+)\. domain\.com [NC]
RewriteCond %{REQUEST_URI} !^/index.php
RewriteRule ^/?(.*) /index.php?/agents/%1/$1 [L]