[SOLVED]: Re: Help improve regular expression for 24 hours format

[Jean Louis]

* 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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