Groups > gnu.bash.bug > #15409 > unrolled thread

Re: Regular Expression matching operation =~

Started by	Chet Ramey <chet.ramey@case.edu>
First post	2019-09-23 09:21 -0400
Last post	2019-09-23 17:14 +0000
Articles	2 — 2 participants

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  Re: Regular Expression matching operation =~ Chet Ramey <chet.ramey@case.edu> - 2019-09-23 09:21 -0400
    Re: Regular Expression matching operation =~ Allodoxaphobia <trepidation@example.net> - 2019-09-23 17:14 +0000

#15409 — Re: Regular Expression matching operation =~

From	Chet Ramey <chet.ramey@case.edu>
Date	2019-09-23 09:21 -0400
Subject	Re: Regular Expression matching operation =~
Message-ID	<mailman.870.1569244925.2190.bug-bash@gnu.org>

On 9/22/19 5:44 PM, Allodoxaphobia wrote:
> In moving a bash ver. 4.3.48 (Ubuntu) program to a bash ver. 5.0.11 
> (FreeBSD) environment I encountered either a bug, a quirk, or 
> an undocumented feature.

It's not exactly undocumented, more undefined. You can't count on the
NUL character or the empty string doing anything in particular.

-- 
``The lyf so short, the craft so long to lerne.'' - Chaucer
		 ``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, UTech, CWRU    chet@case.edu    http://tiswww.cwru.edu/~chet/

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#15416

From	Allodoxaphobia <trepidation@example.net>
Date	2019-09-23 17:14 +0000
Message-ID	<mailman.911.1569258898.2190.bug-bash@gnu.org>
In reply to	#15409

On Mon, 23 Sep 2019 09:21:44 -0400, Chet Ramey wrote:
> On 9/22/19 5:44 PM, Allodoxaphobia wrote:
>
>> In moving a bash ver. 4.3.48 (Ubuntu) program to a bash ver. 5.0.11
>> (FreeBSD) environment I encountered either a bug, a quirk, or
>> an undocumented feature.
>
> It's not exactly undocumented, more undefined. You can't count on 
> the NUL character or the empty string doing anything in particular.

Thanks.  The "undocumented" action made it so much easier
for some coding logic in my linux/Ubuntu environement. :-)

Thanks, also, to Grisha Levit for more details about the "why".

Regards,
Jonesy
--
  Marvin L Jones    | Marvin      | W3DHJ.net  | linux
   38.238N 104.547W |  @ jonz.net | Jonesy     |  FreeBSD
    * Killfiling google & XXXXbanter.com: jonz.net/ng.htm

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Re: Regular Expression matching operation =~

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#15409 — Re: Regular Expression matching operation =~

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