RewriteEngine on
RewriteCond %{HTTP_HOST} ^www\.dvi\.com\.sg$
RewriteCond %{REQUEST_URI} !^/[0-9]+\..+\.cpaneldcv$
RewriteCond %{REQUEST_URI} !^/[A-F0-9]{32}\.txt(?:\ Comodo\ DCV)?$
RewriteRule ^/?$ "http\:\/\/www\.dvi\.solutions\/" [R=301,L]