.htaccess Redirect non-WWW to WWW preserving URI string

I had a similar problem, and this .htaccess works for me

RewriteEngine On                           

#This bit rewrites your host name to include www
RewriteCond %{HTTP_HOST} !^www\.example\.com [NC]
RewriteRule ^(.*)$ http://www.example.com/$1 [R=301,NC,L]

#This bit does the codeigniter magic
RewriteCond %{REQUEST_FILENAME} !-f  
RewriteCond %{REQUEST_FILENAME} !-d  
RewriteRule ^(.*)$ /index.php/$1 [L]

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