bug#72442: 31.0.50; Gnus or message.el doesn't handle international message reply subject prefixes and insults users

["Björn Bidar via Bug reports for GNU Emacs, the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>]

Robert Pluim <rpluim@gmail.com> writes:

>>>>>> On Tue, 20 Aug 2024 15:56:24 +0200, Robert Pluim <rpluim@gmail.com> said:
>
>     Robert> The first is easy. The second is a bit more difficult, since the two
>     Robert> donʼt cover exactly the same cases, and message matches
>     Robert> case-sensitively, unlike rmail, so weʼd need to either adapt eg "ΣΧΕΤ" to
>     Robert> "[Σσ][Χχ][Εε][Ττ]" or make the breaking change of binding
>     Robert> `case-fold-search' in message. Personally Iʼd prefer the latter.
>
>     Robert> (are there really mailers that prefix the subject with "R:"?)
>
> The current setting for rmail is more complete than the suggestion in
> the Gnus manual, except itʼs missing:
>
> - "RÉ"
> - an optional "." after "Antw"
> - an optional space between the "RE" string and the ":"
> - "FW"/"FWD"
>
> The first 3 seem obvious. Adding the last might annoy people :-)
>
> I can add those to `rmail-re-abbrevs', but perhaps itʼs better to have a
> new defcustom that both rmail and message would use? Something like
> 'mail-re-regexps' in "mail-utils.el" perhaps? Plus some appropriate
> editing of the manual.

If there would be an easy way to new prefix to the ignore list that
would work. Can't expect (avarage) users to build their regular
expression especially when multiple languages are involved.