How to use .htaccess to redirect non-www pages to www pages with the exception of a single sub-folder

I'm trying to redirect all non www. urls leading to my site to www. urls - however, there's one subfolder on my site I don't want changed. The code I've been working with is:

Options +FollowSymlinks
RewriteEngine on
rewritecond %{http_host} ^domain.com [nc]
rewriterule ^(.*)$ http://www.domain.com/$1 [r=301,nc]

Is there a wa开发者_如何学运维y to tell this piece of code to ignore domain.com/specialsubfolder?

Thanks a lot, tried searching for this, but couldn't quite find what I'm looking for.

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The common way (easy to read and understand) is to add one more condition to ignore this rule if URL starts with /specialsubfolder :

Options +FollowSymlinks
RewriteEngine On

RewriteCond %{HTTP_HOST} ^domain\.com [NC]
RewriteCond %{REQUEST_URI} !^/specialsubfolder
RewriteRule .* http://www.domain.com%{REQUEST_URI} [R=301,L]

Alternatively, add such condition into matching pattern (more difficult to read but a tiny bit faster):

Options +FollowSymlinks
RewriteEngine On

RewriteCond %{HTTP_HOST} ^domain\.com [NC]
RewriteRule ^(?!specialsubfolder).* http://www.domain.com%{REQUEST_URI} [R=301,L]

P.S. You can add [NC] flags if case-insensitivity is required.