.htaccess

<IfModule mod_rewrite.c>
    RewriteEngine On
    RewriteCond %{HTTP_HOST} ^(www\.|)example\.com
    # RewriteCond %{HTTP_HOST} ^(www\.example|example)\.com
    RewriteRule ^(.*)$ http://new.example.com/$1 [R=302,L]
</IfModule>