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From: Jean Louis <bugs@gnu.support>
To: tomas@tuxteam.de
Cc: help-gnu-emacs@gnu.org, Yuri Khan <yuri.v.khan@gmail.com>
Subject: [SOLVED]: Re: Help improve regular expression for 24 hours format
Date: Thu, 24 Nov 2022 17:22:02 +0300	[thread overview]
Message-ID: <Y39+ChlieLhrK23R@protected.localdomain> (raw)
In-Reply-To: <Y39LNTPP7/yTtsn/@tuxteam.de>

* tomas@tuxteam.de <tomas@tuxteam.de> [2022-11-24 13:47]:
> On Thu, Nov 24, 2022 at 01:31:00PM +0300, Jean Louis wrote:
> 
> [...]
> 
> > Do you have completed example using: 
> > (or (seq "0" (any digit)) (seq "1" (any digit)) (seq "2" (any "0-3"))) ?
> 
> I'm not supposed to be doing this now, so the rest is left as an
> exercise to the reader, alas.
> 
> Hint: look at the regexp your `rx' invocation produces and translate
> backwards from it.

I did the exercise and I came up with the below. It looks much better
this way. 🤝 Thanks much.

(defvar rcd-rx-time (rx line-start
			(or (seq "0" (any digit)) (seq "1" (any digit)) (seq "2" (any "0-3")))
			":"
			(seq (any "0-5") (any digit))
			line-end)
  "Regular expression for 24 hours format")

 ➜ "^\\(?:0[[:digit:]]\\|1[[:digit:]]\\|2[0-3]\\):[0-5][[:digit:]]$"

-- 
Jean

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  reply	other threads:[~2022-11-24 14:22 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
2022-11-24 10:45         ` tomas
2022-11-24 14:22           ` Jean Louis [this message]
2022-11-25 15:31             ` [SOLVED]: " Emanuel Berg
2022-11-26 18:08               ` Jean Louis
2022-11-24 14:30           ` Jean Louis
2022-11-24 13:09 ` Michael Heerdegen

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