From: Peter Stephenson <p.stephenson@samsung.com>
To: Zsh Users <zsh-users@zsh.org>
Subject: Re: Non-greedy matching (S-flag) behaving weird
Date: Fri, 8 Jun 2018 14:54:32 +0100 [thread overview]
Message-ID: <20180608135436eucas1p2672a3bf2fe4781a1a588e85aa0c8fda2~2M8xnZsPd1645716457eucas1p2_@eucas1p2.samsung.com> (raw)
In-Reply-To: <20180608143012.394398bf@camnpupstephen.cam.scsc.local>
On Fri, 8 Jun 2018 14:30:12 +0100
Peter Stephenson <p.stephenson@samsung.com> wrote:
> On Fri, 8 Jun 2018 08:48:05 +0200
> Sebastian Gniazdowski <sgniazdowski@gmail.com> wrote:
> >
> > ~ __wrd2="echo abc | awk '{ print \$1 } END { print 'Finished' }'"
> >
> > ~
> > __wrd2="${(S)__wrd2/(#b)(#s)(*)(BEGIN|END|print)(*)(#e)/${match[3]}}";
>
> You are onto a loser with multiple *'s with the greedy match rule
> relaxed; it's poorly defined. so the fact it's not doing what you
> expect isn't saying anything. (That's why the greedy match rule
> is there in the first place.) But you'll be better off consulting
> a more authoritative source than me if you want more, so I'll
> sign off now.
I should probably point out, though, that the (S) flag in any
case only guarantees to make the match for the *whole* left part of
the /.../... expression as short as possible. Given you're forcing it
to match the entire string in any case, it has no effect.
It is not documented to match *individual parts* of the match
expression in any particular way. So actually my remarks on non-greedy
matching aren't relevant. Sorry I didn't check the doc earlier
instead of spreading unnecessary confusion.
pws
prev parent reply other threads:[~2018-06-08 13:54 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <CGME20180608064952epcas4p4e8890504ddaf097f8d0df1cb1e89d619@epcas4p4.samsung.com>
2018-06-08 6:48 ` Sebastian Gniazdowski
2018-06-08 8:15 ` Peter Stephenson
2018-06-08 12:42 ` Sebastian Gniazdowski
2018-06-08 12:48 ` Sebastian Gniazdowski
2018-06-08 13:30 ` Peter Stephenson
[not found] ` <20180608143012.394398bf@camnpupstephen.cam.scsc.local>
2018-06-08 13:54 ` Peter Stephenson [this message]
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