RewriteEngine on

RewriteCond %{HTTP:X-Forwarded-Host} ^shorturl\.speedia\.co\.jp$
RewriteRule ^[0-9a-zA-Z]{5,20}$ https://basc.speedia.co.jp/r/$0 [R=301,L]

RewriteCond %{HTTP:X-Forwarded-Host} ^shorturl\.accelia\.jp$
RewriteRule ^[0-9a-zA-Z]{5,20}$ https://basc.accelia.jp/r/$0 [R=301,L]

RewriteCond %{HTTP_HOST} ^4po\.jp$
RewriteRule ^[0-9a-zA-Z]{5,20}$ https://4po.jp/basc/r/$0 [R=301,L]