Re: A RE: AW: "collapser", anyone...?

[lawrence mitchell <s0198183+ding@sms.ed.ac.uk>]

Maciej Matysiak wrote:

[...]

> could you please provide an example: how do i get with regexp-opt
> the equivalent of "[Aa][Nn][Tt][Ww]\\.?"? maybe it's simpler to use
> that function, but one needs to type a lot and think of at least few
> possible variations (in this particular case). the above regexp takes
> care of everything and doesn't look scary (imho).

You don't :).  You (let ((case-fold-search t)) ...) in
`message-strip-subject-re'.

Then you can do things like:
(regexp-opt
 '("antw." "aw" "sv" "re"))
    => "a\\(?:ntw\\.\\|w\\)\\|re\\|sv"

Which I think is certainly easier to read than all the grouping
constructs, and, as an extra bonus, it's more efficient at
matching.

Additionally, this makes it easier to customize
`message-subject-re-regexp', since one can just ask for a list
of strings, and then do some magic behind the scenes.  The user
need not know the ins and outs of Emacs' regexps.

> i think that the message-subject-re-regexp i've made up with
> concatenated regexp is quite readable. but ymmv :)

perlist ;).

-- 
lawrence mitchell <s0198183+ding@sms.ed.ac.uk>