Wildcard on DocumentRoot for virtualhost

Set rewrite rule grab the sub.domain and redirect to /sub/requestedFile

RewriteCond %{HTTP_HOST} ^([a-zA-Z0-9-]+)\.example.com$
RewriteRule ^(.+) /%1/$1 [L,QSA]

Or set VirtualDocumentRoot with %-1 representing the sub domain.

<VirtualHost *:80>
  VirtualDocumentRoot /var/www/%-1
  ServerName sumdomains.example.com
  ServerAlias *.example.com
</VirtualHost>

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