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From: Sebastian Gniazdowski <sgniazdowski@gmail.com>
Date: Wed, 7 Oct 2015 18:06:43 +0200
Message-ID: <CAKc7PVCY5x27DuD7buR8_TKukMtzA_4_ApZv2ipMxGDb_d6KvQ@mail.gmail.com>
Subject: Re: Possible bug with $~pattern, (#mi)
To: Peter Stephenson <p.stephenson@samsung.com>
Cc: zsh-workers@zsh.org
Content-Type: text/plain; charset=UTF-8

True, beg wasn't set in first invocation. However pattern #(#mi)1 is correct:

# a="1234"; echo ${a/#(#mi)1/-}
-234

When beg is used (this time correctly):

# a="1234"; beg="#"; echo ${a/$~beg(#mi)1/-}
zsh: bad pattern: #(#mi)1

Best regards,
Sebastian Gniazdowski


On 7 October 2015 at 17:39, Peter Stephenson <p.stephenson@samsung.com> wrote:
> On Wed, 7 Oct 2015 17:28:04 +0200
> Sebastian Gniazdowski <sgniazdowski@gmail.com> wrote:
>> first one and third one are the same, but only first invocation works.
>> Not sure if second one should work:
>>
>>  # a="1234"; beg="#" echo ${a/$~beg(#mi)1/-}
>> -234
>>  # a="1234"; beg="#"; num=1; echo ${a/$~beg(#mi)$~num/-}
>> zsh: bad pattern: #(#mi)1
>>  # a="1234"; beg="#" echo ${a/$~beg(#mi)1/-}
>> zsh: bad pattern: #(#mi)1
>>  #
>
> The difference is the first one doesn't have $beg defined at the point
> where the expansion takes place, because beg is being put into the
> environment to use when the command is run.  The environment of the
> command is not the same thing as the set of variables avaiable to the
> shell for preparing the command line.
>
> So what you're executing that works is actually
>
> a="1234"
> echo ${a/(#mi)1/-}
>
> After that, the result is self explanatory --- #(#mi) is a bad pattern
> (with EXTENDED_GLOB set).
>
> pws