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node /^ws-([[:digit:]]+)/ {
  $structure = 'ca'
  $hostid = $2
  notice("site.pp: Hostid: $hostid")

  # Same regex as above
  if $hostname =~ /^ws-([[:digit:]]+)/ {
    notice("\$2: $2")
  }
  
  class { 'host_type::ws':
    structure => $structure,
  }
}


When run against a machine ws-01, I get out:

puppet-master[29847]: (Scope(Node[ws-:digit:])) site.pp: Hostid: 
puppet-master[29847]: (Scope(Node[ws-:digit:])) $2: 01