anchor.diff:      do_1(In#{<<"text">> => PreText, <<"attachments">> => nil});
   do_1(#{<<"type">> := <<"message">>, <<"text">> := Text, <<"channel">> := Channel}) ->
       Tasks0 = [
  -              {{mention, <<"remind">>},                         {?MODULE, task_remind,     [Text, Channel]}},
  -              {<<"https?://[^\s]*(pull|issue)/[0-9]*">>,        {?MODULE, task_github_url, ['$$']}},
  -              {{mention, <<"list(.*)">>},                       {?MODULE, task_list,       ['$1', Channel]}},
  -              {{mention, <<"register\s+([^\s]*)\s+([^\s]*)">>}, {?MODULE, task_register,   ['$1', '$2', Channel]}},
  -              {{mention, <<"user\s+([^\s]*)">>},                {?MODULE, task_user,       ['$1', Channel]}},
  -              {{mention, <<"help">>},                           {?MODULE, task_help,       [Channel]}},
  -              {{mention, <<"^.*">>},                            {?MODULE, task_help,       [Channel]}}
  +              {{mention, <<"remind">>},                             {?MODULE, task_remind,     [Text, Channel]}},
  +              {<<"https?://[^\\s]*(pull|issue)/[0-9]*">>,           {?MODULE, task_github_url, ['$$']}},
  +              {{mention, <<"list(.*)">>},                           {?MODULE, task_list,       ['$1', Channel]}},
  +              {{mention, <<"register\\s+([^\\s]*)\\s+([^\\s]*)">>}, {?MODULE, task_register,   ['$1', '$2', Channel]}},
  +              {{mention, <<"user\\s+([^\\s]*)">>},                  {?MODULE, task_user,       ['$1', Channel]}},
  +              {{mention, <<"help">>},                               {?MODULE, task_help,       [Channel]}},
  +              {{mention, <<"^.*">>},                                {?MODULE, task_help,       [Channel]}}
                ],
       Tasks = choose_tasks(Text, Tasks0),
       execute_tasks(Tasks);
  
positive.code: %%----------------------------------------------------------------------------------------------------------------------
  
  task_remind(Text, Channel) ->
      Matches = matches(Text, <<"https?://[^\s]*(pull|issue)/[0-9]*">>),
      Urls = [GithubUrl || [GithubUrl | _] <- Matches],
      Ret = preminder_pr:r_list(Urls),
      preminder_slack:post(Channel, bbmustache:compile(bbmustache:parse_file(?PRIV("list_all.mustache")), Ret)).
  
negative.code: %% e.g.
  %% ```
  %% Input   : <<"[[[ https://github.com/soranoba/preminder ]]]">>
  %% Pattern : <<"https?://github.com/([^/\\s]*)/([^/\\s]*)">>
  %%
  %% $$ : <<"https://github.com/soranoba/preminder">>
  %% $1 : <<"soranoba">>
  