redirect subdomain to another sub domain using htaccess OR find url and file extension and redirect to other url

RewriteCond %{HTTP_HOST} ^corpwp\.dev\.gic\.dos\.state\.de\.us$ [NC]
#RewriteRule ^(.*)$ https://news.delaware.gov/$1 [R=301,L]
RewriteRule (.*)\.pdf$ https://corpfiles.delaware.gov/$1.pdf [R=301,L]