.htaccess subdomain argument not accessible in query string

I have written the following rules in .htaccess

RewriteCond %{HTTP_HOST} ^([^\.]+)\.domain\.com 

RewriteCond %1 !^www$ [NC]

RewriteCond %{REQUEST_URI} ^/news/news-details\.php$

RewriteRule (.*) news.php?div=%1

What it does is transfer the request the news.php file with the div variable equal to news/news-details.php . I do not need the div to be like that. I need the value of the subdomain that has been written with the domain like if the user is coming from user.domain.com/news/news-details.php . I need the div variable in the news.php file to be user i.e. news.php?div=user .

EDIT: Here is now the Htaccess code It is causing problem for the root news details page Options

+FollowSymLinks

RewriteEngine on



# For Accessing News Details Page for root http://www.domain.com/news/news-details.php

RewriteCond %{HTTP_HOST} ^www.domain\.com [NC]

RewriteRule ^news/news-details.php$ news.php [QSA,NC,L]





# For Accessing News Details Page http://user.domain.com/news/news-details.php

RewriteCond %{HTTP_HOST} ^(.+)\.domain\.com [NC]

RewriteCond %{HTTP_HOST) !^www\.

RewriteRule ^news/news-details.php$  news.php?div=%1 [QSA,NC,L





# For www.domain.com it should go to the index page

RewriteCond %{HTTP_HOST} ^(www\.)?domain.com$ [NC]

RewriteRule ^(.*)$ index.php [NC,L]





# For Accessing Divisions Page user.domain.com should go to domain.com/divisions.php?division=user

RewriteCond %{HTTP_HOST} !^www\.domain\.com$

RewriteCond %{HTTP_HOST} ^(.*)\.domain\.com$

RewriteRule ^$ /divisions.php?division=%1 [L]

AGAIN EDIT:

Here these two rules are conflicting

# For www.domain.com it should go to my-index.php page

#

RewriteCond %{HTTP_HOST} ^(www\.)?domain\.com$ [NC]

RewriteRule ^(.*)$ my-index.php [NC,L]





# For Page URL http://www.domain.com/news/news-details.php

#

RewriteCond %{REQUEST_URI} ^/news/news\-details\.php [NC]

RewriteCond %{HTTP_HOST} ^www\.domain\.com$  [NC]

RewriteRule ^(.*)$ my-news.php [NC,QSA,L]

Source: Tips4all