From: Stephane Chazelas <stephane.chazelas@gmail.com>
To: Bart Schaefer <schaefer@brasslantern.com>
Cc: Zsh hackers list <zsh-workers@zsh.org>
Subject: Re: Issue with ${var#(*_)(#cN,M)}
Date: Tue, 20 Oct 2015 20:09:46 +0100 [thread overview]
Message-ID: <20151020190946.GA6560@chaz.gmail.com> (raw)
In-Reply-To: <151019121728.ZM324@torch.brasslantern.com>
2015-10-19 12:17:28 -0700, Bart Schaefer:
> On Oct 19, 10:33am, Stephane Chazelas wrote:
> } Subject: Issue with ${var#(*_)(#cN,M)}
> }
> } Unless I'm missing something, this looks like a bug:
>
> Hm. I think it's counting the number of times it backtracked. E.g.
>
> } ~$ a='1_2_3_4_5_6'
> } ~$ echo ${a#(*_)(#c2)}
> } 2_3_4_5_6
>
> Here, it first matched "1_2_3_4_5_" but then couldn't match a second
> time, so it backtracked, matched "1_", and stopped counting.
[...]
Note that the:
~$ echo ${a#*_*_}
3_4_5_6
~$ echo ${a#*_*_*_}
4_5_6
work OK.
And also:
~$ echo ${a#(*_)(*_)(*_|)}
3_4_5_6
~$ echo ${a#(*_)(*_)(*_|)4}
_5_6
(equivalent of (#c2,3))
--
Stephane
next prev parent reply other threads:[~2015-10-20 19:09 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-10-19 9:33 Stephane Chazelas
2015-10-19 19:17 ` Bart Schaefer
2015-10-20 19:09 ` Stephane Chazelas [this message]
2015-10-20 23:04 ` Bart Schaefer
2015-10-27 10:00 ` Peter Stephenson
2015-10-27 10:46 ` Peter Stephenson
2015-10-27 11:03 ` Stephane Chazelas
2015-10-27 11:11 ` Peter Stephenson
2015-10-27 11:11 ` Stephane Chazelas
2015-10-27 11:37 ` Peter Stephenson
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