# activate URL rewriting
RewriteEngine on

# Remove www
RewriteCond %{HTTP_HOST} ^www.mywebsite.com$ [NC]
RewriteRule ^(.*)$ http://mywebsite.com/$1 [R=301,L]

# do not rewrite links to the documentation, assets and public files
RewriteCond $1 !^(index.php|public|images|robots.txt)

# do not rewrite for php files in the document root, robots.txt or the maintenance page
RewriteCond $1 !^([^..]+.php|robots.txt|sitemap.xml)

# but rewrite everything else
RewriteRule ^(.*)$ index.php?/$1 [L]