.htaccess redirect issue

Hi there all, we have the following in our htaccess, for auto creating sub domains:

RewriteCond %{REQUEST_URI} !^/-
RewriteCond %{HTTP_HOST} ^([^\./]+)
RewriteCond %{DOCUMENT_ROOT}/domains/-%1 -d
RewriteRule ^([^.]*)$ domains/-%1/ [L]

Code (markup):

Now, works perfert for http://sub.domain.com but if you try to go to http://www.sub.domain.com it just shows the main site at domain.com not the sub.domain.com one.

Thoughts please.

 

Anyone got any suggestions on this issue please?

Have also tried:

RewriteCond %{REQUEST_URI} !^/-
RewriteCond %{HTTP_HOST} !^www\.domain\.co.\nz$ [NC]
RewriteCond %{HTTP_HOST} ^(www\.)?([^\.]+)\.domain\.co.\nzt$ [NC]
RewriteCond %{DOCUMENT_ROOT}/domains/-%1 -d
RewriteRule ^([^.]*)$ domains/-%1/ [L]

Code (markup):

Still no go...