.htaccess instructions conflict "DocumentRoot change" + "always display subdomain"

I have a rewrite that changes my DocumentRoot from /public_html to /public_html/MAIN and it works great.

RewriteRule ^$ /MAIN/ [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_URI} !^/MAIN/
RewriteRule ^(.*)$ /MAIN/$1

Now If I try to add the following instruction to always show the www subdomain, it no longer behaves properly...

RewriteCond %{http_host} ^domain.com [nc]  
RewriteRule ^(.*)$ http://www.domain.com/$1 [r=301,nc]

Visiting http://domain.com/ causes a rewrite to http://www.domain.com/M开发者_运维百科AIN/ which is not what I want. I do not want the MAIN subdirectory to be visible.

What am I missing?

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The ^(.*)$ pattern captures the current URI, no matter it's in the location bar or it's an internal redirection. One of these solutions should work:

• Put the subdomain redirection first
• Replace $1 with a variable, e.g. %{REQUEST_URI}