    # File lib/chef/knife/client_bulk_delete.rb, line 32
          def run
            if name_args.length < 1
              ui.fatal("You must supply a regular expression to match the results against")
              exit 42
            end
            all_clients = Chef::ApiClient.list(true)

            matcher = /#{name_args[0]}/
            clients_to_delete = {}
            all_clients.each do |name, client|
              next unless name =~ matcher
              clients_to_delete[client.name] = client
            end

            if clients_to_delete.empty?
              ui.info "No clients match the expression /#{name_args[0]}/"
              exit 0
            end

            ui.msg("The following clients will be deleted:")
            ui.msg("")
            ui.msg(ui.list(clients_to_delete.keys.sort, :columns_down))
            ui.msg("")
            ui.confirm("Are you sure you want to delete these clients")

            clients_to_delete.sort.each do |name, client|
              client.destroy
              ui.msg("Deleted client #{name}")
            end
          end