.htaccess - mod_rewrite: url rewriting plus subdomain (wildcard) rewrite at the same time

i have two rules in my .htaccess file for url rewriting:

1. for subdomain rewriting: xxx.domain.com is internally redirected to file.php?item=xxx

   
   
   

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

   
   
   

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

   
   
   
   

   RewriteRule ^$ /file.php?item=%2 [QSA,nc]

   
   
   

   2.ordinary rewriting:

   
   
   

   RewriteRule ^([A-Za-z0-9_)(:!-',]+)/?$ file.php?item=$1 [L]

What i need to achieve is writing a third rule that will combine these two rules without being in conflict with them. Namely, below (or above) this lines i need to have something like that

RewriteCond %{HTTP_HOST} ^(www\.)?([^\.]+)\.domain\.com/([A-Za-z0-9_)(:!-',]+)$ [NC]

RewriteRule ^$ /anotherfile.php?item1=%2&item2=$1 [QSA,nc]

so that http://xxx.domain.com/yyy will be redirected to anotherfile.php?item1=xxx&item2=yyy

any ideas that will work, or what is the correct way of it?