From: Michael Heerdegen <michael_heerdegen@web.de>
To: Emacs mailing list <help-gnu-emacs@gnu.org>
Subject: Shy groups and * ...eh, what?
Date: Sat, 22 Oct 2022 06:24:39 +0200 [thread overview]
Message-ID: <87edv0mqns.fsf@web.de> (raw)
Hello,
I wanted to be sure I correctly understood that if you give multiple RX
arguments to the `rx' `*' operator, they are implicitly interpreted as a
sequence (AFAIU, that's the case. An implicit `or' would also make
sense, that's why I wondered).
Anyway, here is what I tried:
(string-match-p
(rx bos (* "a" "b") eos)
"a")
==> 0
(string-match-p
(rx bos (* "a" "b") eos)
"b")
==> nil
Eh - what? With evaluated `rx' forms this is
(string-match-p
"\\`\\(?:ab\\)*\\'"
"a")
==> 0
(string-match-p
"\\`\\(?:ab\\)*\\'"
"b")
==> nil
Makes no sense to me. When I change the wrapping shy groups to normal
groups the result makes more sense to me:
(string-match-p
"\\`\\(ab\\)*\\'"
"a")
==> nil
(string-match-p
"\\`\\(ab\\)*\\'"
"b")
==> nil
Do I miss something or is it just a bug?
TIA,
Michael.
next reply other threads:[~2022-10-22 4:24 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-10-22 4:24 Michael Heerdegen [this message]
2022-10-22 6:11 ` Shy groups and * ...eh, what? Heime
2022-10-22 6:39 ` tomas
2022-10-23 2:47 ` Michael Heerdegen
2022-10-24 4:45 ` tomas
2022-10-24 21:01 ` Emanuel Berg
2022-10-25 3:12 ` Michael Heerdegen
2022-10-25 3:44 ` Emanuel Berg
2022-10-25 4:43 ` tomas
2022-10-22 6:49 ` Heime
2022-10-22 7:37 ` Michael Heerdegen
2022-10-22 8:34 ` tomas
2022-10-22 8:41 ` Michael Heerdegen
2022-10-22 11:12 ` Bruno Barbier
2022-10-23 2:45 ` Michael Heerdegen
2022-10-24 4:27 ` Emanuel Berg
2022-10-22 19:54 ` [External] : " Drew Adams
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