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From: Oliver Kiddle <okiddle@yahoo.co.uk>
To: Sebastian Gniazdowski <sgniazdowski@gmail.com>
Cc: Zsh hackers list <zsh-workers@zsh.org>
Subject: Re: PATCH: Update the description of S flag in the completion
Date: Tue, 03 Dec 2019 11:39:12 +0100
Message-ID: <4702-1575369552.992754@BTqk.3315.8qcb> (raw)
In-Reply-To: <CAKc7PVDHqmBj5g3_JasumDnent5c71+-G5LhRq6LdTTuFeeEsQ@mail.gmail.com>

Sebastian Gniazdowski wrote:
> On that occasion, isn't this a bug?:
>
> ❯ str="ab##c#d"; print ${(S)str##\#}
> ab#c#d
> ❯ str="ab##c#d"; print ${(S)str##\##}
> ab##c#d
>
> Why no match at all in the second case?

It does not exhaustively find the longest match. It takes the first
possible match but matches that one greedily. The first possible match
is the empty string at the beginning of the string.

I think the following demonstrates how this works more clearly:

  % str="aXXbXXXXXXXXc"; print ${(S)str##X##}
  abXXXXXXXXc

This matches the shorter block of Xs between a and b and the greedyness
means that both Xs were matched. ${(S)str#X##} returns aXbXXXXXXXXc.

Oliver

      parent reply index

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-12-02  0:31 Sebastian Gniazdowski
2019-12-02  0:46 ` Sebastian Gniazdowski
2019-12-03  5:16   ` Sebastian Gniazdowski
2019-12-03  9:42     ` Peter Stephenson
2019-12-03 14:45       ` Sebastian Gniazdowski
2019-12-03 10:39   ` Oliver Kiddle [this message]

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