all messages for Emacs-related lists mirrored at yhetil.org
 help / color / mirror / code / Atom feed
From: Jean Louis <bugs@gnu.support>
To: tomas@tuxteam.de
Cc: help-gnu-emacs@gnu.org, Yuri Khan <yuri.v.khan@gmail.com>
Subject: Re: Help improve regular expression for 24 hours format
Date: Thu, 24 Nov 2022 13:31:00 +0300	[thread overview]
Message-ID: <Y39H5HEkE4xU2GSX@protected.localdomain> (raw)
In-Reply-To: <Y387k1/Fje/xktpT@tuxteam.de>

* tomas@tuxteam.de <tomas@tuxteam.de> [2022-11-24 12:40]:
> > Thanks, I make it now this way:
> > 
> > (defvar rcd-rx-time (rx line-start (or "00" "01" "02" "03" "04" "05" "06" "07" "08" "09" "10" "11" 
> >  				       "12" "13" "14" "15" "16" "17" "18" "19" "20" "21" "22" "23")
> >  			":" (any "0" "1" "2" "3" "4" "5") (any digit)
> > 			line-end)
> >   "Regular expression for 24 hours format")
> 
> Hm. By distributive law, (or (seq (any "01") (any digit)) (seq "2" (any "03")))
> should cover your hours part. And for the minutes's first digit, remember that
> `any' can do ranges: (any "0-5") resp. (any (?0 . ?5))
> 
> >  ➜ "^\\(?:0[0-9]\\|1[0-9]\\|2[0-3]\\):[0-5][[:digit:]]$"
> 
> Even taking inspiration on what the "compiler" did of your expression might
> lead you to a simpler (and more readable!) expression, e.g.
> 
>   (or (seq "0" (any digit)) (seq "1" (any digit)) (seq "2" (any "0-3")))
> 
> although slightly longer than my first proposal (perhaps the second is
> "quicker", but I'd let the regexp compiler sort that out: you are
> optimising for the human reader, after all).


Do you have completed example using: 
(or (seq "0" (any digit)) (seq "1" (any digit)) (seq "2" (any "0-3"))) ?

-- 
Jean

Take action in Free Software Foundation campaigns:
https://www.fsf.org/campaigns

In support of Richard M. Stallman
https://stallmansupport.org/



  reply	other threads:[~2022-11-24 10:31 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-11-24  3:36 Help improve regular expression for 24 hours format Jean Louis
2022-11-24  5:50 ` tomas
2022-11-24  6:32 ` Yuri Khan
2022-11-24  8:59   ` Jean Louis
2022-11-24  9:38     ` tomas
2022-11-24 10:31       ` Jean Louis [this message]
2022-11-24 10:45         ` tomas
2022-11-24 14:22           ` [SOLVED]: " Jean Louis
2022-11-25 15:31             ` Emanuel Berg
2022-11-26 18:08               ` Jean Louis
2022-11-24 14:30           ` Jean Louis
2022-11-24 13:09 ` Michael Heerdegen

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=Y39H5HEkE4xU2GSX@protected.localdomain \
    --to=bugs@gnu.support \
    --cc=help-gnu-emacs@gnu.org \
    --cc=tomas@tuxteam.de \
    --cc=yuri.v.khan@gmail.com \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body.
Code repositories for project(s) associated with this external index

	https://git.savannah.gnu.org/cgit/emacs.git
	https://git.savannah.gnu.org/cgit/emacs/org-mode.git

This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.