rule "remove_field"
when true
then
  set_field(field: "f1", value: "f1");
  set_field(field: "f2", value: "f2");
  set_field(field: "f3", value: "f3");
  set_field(field: "i1", value: "i1");
  set_field(field: "i2", value: "i2");

  remove_field(field:"f1");
  remove_field(field:"f.", invert:true);
end
