anchor.diff:  
   referenced_dtls1(Step, Config, Seen) ->
       DtlOpts = erlydtl_opts(Config),
  -    ExtMatch = re:replace(option(source_ext, DtlOpts), "\.", "\\\\.",
  +    ExtMatch = re:replace(option(source_ext, DtlOpts), "\.", "\\\\\\\\.",
                             [{return, list}]),
       AllRefs = lists:append(
                   [ string:tokens(
  
positive.code: default(source_ext) -> ".dtl";
  default(module_ext) -> "_dtl".
  
  referenced_dtls(Source, _Target, Config) ->
      Set = referenced_dtls1([Source], Config,
                            sets:add_element(Source, sets:new())),
      Final = sets:to_list(sets:del_element(Source, Set)),
  
negative.code:     New = sets:subtract(sets:from_list(Existing), Seen),
      case sets:size(New) of
          0 -> Seen;
          _ -> referenced_dtls1(sets:to_list(New), Config,
                                sets:union(New, Seen))
      end.
  
  