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* bug#41006: 26.3; regular expressions documentation
@ 2020-05-01 19:06 jan via Bug reports for GNU Emacs, the Swiss army knife of text editors
  2020-05-03  3:40 ` Richard Stallman
                   ` (2 more replies)
  0 siblings, 3 replies; 50+ messages in thread
From: jan via Bug reports for GNU Emacs, the Swiss army knife of text editors @ 2020-05-01 19:06 UTC (permalink / raw)
  To: 41006

Hi, 3 issues (nothing major).

1. Suggest emacs' excellent documentation should not distinguish between
Regexps and Regexp Backslash in the manual.
That is, these 2 should be combined:


  * Regexps::                   Syntax of regular expressions.
  * Regexp Backslash::          Regular expression constructs starting with ‘\’.

AFAICS the difference is purely arbitrary.
There have been times I've looked for the syntax for such syntax and
found it only because I knew it was there, but not in the same
section. A beginner might conclude emacs doesn't support them.


2. The documentation for {N, M} repetitions matching is incomplete (has
been a long time). Docs say M may be omitted but from testing I find N
may be omitted also ie \{,M\} is valid, and useful.

eg.

ba\{,2\}d

correctly matches only the top 2 of

bad
baad
baaad
baaaad


3. This from the docs

‘\=’
     matches the empty string, but only at point.

baffles me. I've had a hard look for any examples of how it may be used
and found nothing. I feel I may be missing something extremely useful, I
just don't know what!

thanks

jan



In GNU Emacs 26.3 (build 1, x86_64-w64-mingw32)
 of 2019-08-29 built on CIRROCUMULUS
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^ permalink raw reply	[flat|nested] 50+ messages in thread

end of thread, other threads:[~2022-04-29 12:22 UTC | newest]

Thread overview: 50+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2020-05-01 19:06 bug#41006: 26.3; regular expressions documentation jan via Bug reports for GNU Emacs, the Swiss army knife of text editors
2020-05-03  3:40 ` Richard Stallman
2020-05-03 10:31   ` jan via Bug reports for GNU Emacs, the Swiss army knife of text editors
2020-05-03 13:07 ` Mattias Engdegård
2020-05-03 14:00   ` jan via Bug reports for GNU Emacs, the Swiss army knife of text editors
2020-05-03 20:08   ` Drew Adams
2020-05-03 20:31     ` Stefan Kangas
2020-05-04  1:00       ` Drew Adams
2020-05-05  2:56       ` Richard Stallman
2020-05-05 10:05         ` jan via Bug reports for GNU Emacs, the Swiss army knife of text editors
2020-05-05 16:51           ` Mattias Engdegård
2020-05-05 18:20         ` Stefan Kangas
2020-05-05 18:40           ` Drew Adams
2020-05-05 19:04             ` Stefan Kangas
2020-05-05 19:42               ` Drew Adams
2020-05-05 21:23                 ` Stefan Kangas
2020-05-05 21:37                   ` Drew Adams
2020-05-07  2:40                   ` Richard Stallman
2020-05-09  3:48               ` Richard Stallman
2020-05-07  2:41             ` Richard Stallman
2020-05-07  3:17               ` Drew Adams
2020-05-08  2:51                 ` Richard Stallman
2020-05-07 10:31               ` Stefan Kangas
2020-05-07  2:41           ` Richard Stallman
2020-05-07  3:18             ` Drew Adams
2020-05-07 10:32             ` Stefan Kangas
2020-05-08  2:49               ` Richard Stallman
2020-05-08  6:47                 ` Eli Zaretskii
2020-05-08 10:10                   ` Stefan Kangas
2020-05-08 10:31                     ` Eli Zaretskii
2020-05-08 18:17                       ` Stefan Kangas
2020-05-08 18:47                         ` Eli Zaretskii
2020-05-08 20:09                           ` Stefan Kangas
2020-05-08 10:04                 ` jan via Bug reports for GNU Emacs, the Swiss army knife of text editors
2020-05-09  3:56                   ` Richard Stallman
2020-05-08 16:49                 ` Drew Adams
2020-05-09  3:53                   ` Richard Stallman
2020-05-09  3:54                   ` Richard Stallman
2020-05-07  2:41           ` Richard Stallman
2020-05-04  3:10   ` Richard Stallman
2020-05-04  9:13     ` jan via Bug reports for GNU Emacs, the Swiss army knife of text editors
2020-05-05  2:56       ` Richard Stallman
2020-05-05 10:02         ` jan via Bug reports for GNU Emacs, the Swiss army knife of text editors
2020-05-05 17:12     ` Mattias Engdegård
2020-05-05 17:40       ` Eli Zaretskii
2020-05-05 17:50         ` jan via Bug reports for GNU Emacs, the Swiss army knife of text editors
2020-05-05 18:09         ` Stefan Kangas
2020-05-05 18:23           ` Eli Zaretskii
2020-05-07  2:42       ` Richard Stallman
2022-04-29 12:22 ` Lars Ingebrigtsen

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