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From: philippe schnoebelen <schnoebelen.ph@gmail.com>
To: "Mattias Engdegård" <mattiase@acm.org>
Cc: HaiJun Zhang <netjune@outlook.com>,
	Emacs developers <emacs-devel@gnu.org>
Subject: Re: regular expressions that match nothing
Date: Mon, 20 May 2019 09:56:47 +0200	[thread overview]
Message-ID: <CADqJmR356cduYr32njDQaO_1Fg8fsCkOjOXqibd3sWX8L-DLKw@mail.gmail.com> (raw)
In-Reply-To: <0E7D1DF3-682F-4FB9-8378-FEA3E9FDE5E9@acm.org>

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The (real) risk of misunderstanding exists with all options that include
"null", "empty", "void", "nothing", "nada". The name refers to a set of
matches but can be understood as qualifying the match itself, as a set of
chars. If you teach programming and mark code written by students, you know
that the confusion will definitely happen.

This is why I much prefer Alan's re-nomatch suggestion.

On Sun, 19 May 2019 at 09:33, Mattias Engdegård <mattiase@acm.org> wrote:

> 19 maj 2019 kl. 07.00 skrev HaiJun Zhang <netjune@outlook.com>:
> >
> > > regexp-null? It's also a little cryptic, but it's short!
> >
> > What about regexp-nothing or re-nothing?
>
> Those are fair suggestions and close to the mathematical meaning, but
> could possibly be misunderstood as patterns (only) matching the empty
> string.
>
>
>

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  reply	other threads:[~2019-05-20  7:56 UTC|newest]

Thread overview: 37+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-05-14  7:25 regular expressions that match nothing philippe schnoebelen
2019-05-14 10:14 ` Mattias Engdegård
2019-05-14 19:41   ` Stefan Monnier
2019-05-15 16:21     ` Mattias Engdegård
2019-05-15 19:41       ` Alan Mackenzie
2019-05-16 10:54         ` Mattias Engdegård
2019-05-16 23:18           ` Phil Sainty
2019-05-17  9:43             ` Alan Mackenzie
2019-05-17 10:17               ` Mattias Engdegård
2019-05-17 12:53               ` Stefan Monnier
2019-05-15 20:17       ` Michael Heerdegen
2019-05-15 21:06         ` Stefan Monnier
2019-05-15 21:07         ` Mattias Engdegård
2019-05-15 21:38           ` Michael Heerdegen
2019-05-16  6:57           ` More re odditie [Was: regular expressions that match nothing] phs
2019-05-16  9:29             ` Mattias Engdegård
2019-05-16 10:59               ` phs
2019-05-16 12:31                 ` Stefan Monnier
2019-05-16 18:35             ` Michael Heerdegen
2019-05-16 20:31               ` Mattias Engdegård
2019-05-16 21:01                 ` Global and local definitions of non-functions/variable (was: More re odditie [Was: regular expressions that match nothing]) Stefan Monnier
2019-05-20 16:26           ` Bootstrap/autoload policy (was Re: regular expressions that match nothing) Mattias Engdegård
2019-05-22 14:02             ` Stefan Monnier
2019-05-22 14:07               ` Mattias Engdegård
2019-05-22 14:24                 ` Stefan Monnier
2019-05-22 15:06                   ` Mattias Engdegård
2019-05-22 15:53                     ` Stefan Monnier
2019-05-22 16:40                       ` Mattias Engdegård
2019-05-22 19:08                         ` Stefan Monnier
2019-05-26 12:05                         ` Basil L. Contovounesios
2019-05-16 18:12       ` regular expressions that match nothing Eric Abrahamsen
2019-05-19  4:30         ` 回复: " net june
2019-05-19  5:00           ` HaiJun Zhang
2019-05-19  7:32             ` Mattias Engdegård
2019-05-20  7:56               ` philippe schnoebelen [this message]
2019-05-20 23:19                 ` Richard Stallman
2019-05-19 14:12           ` 回复: " Drew Adams

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