body common control {
  bundlesequence => { nagios };
}

bundle agent nagios {
files:
  "/root/the_file"
     edit_line => "do_edit";
}

bundle edit_line do_edit
{
  delete_lines:
    ".*"
    select_region => our_code;
  insert_lines:
    "#begin
        alpha
        bravo
        charly
        #end"
    location => output_line;
}

body location output_line
{
   before_after => "after";
   first_last => "first";
   select_line_matching => ".*ONE";
}

body select_region our_code
{
   select_start => "^#begin";
   select_end => "#end";
   include_start_delimiter => "true";
   include_end_delimiter => "true";
}