    # File lib/chef/knife/node_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

            nodes_to_delete = {}
            matcher = /#{name_args[0]}/

            all_nodes.each do |name, node|
              next unless name =~ matcher
              nodes_to_delete[name] = node
            end

            if nodes_to_delete.empty?
              ui.msg "No nodes match the expression /#{name_args[0]}/"
              exit 0
            end

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

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