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List:       perl5-porters
Subject:    Re: /(?<!st)/i is variable width - can we document this surprise better?
From:       Sawyer X <xsawyerx () gmail ! com>
Date:       2017-10-31 16:24:34
Message-ID: 5e3e96e6-864b-52f1-c60a-9e97889f50c2 () gmail ! com
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On 10/28/2017 09:44 PM, Karl Williamson wrote:
> On 08/23/2017 07:57 AM, Abigail wrote:
>> On Wed, Jul 05, 2017 at 05:11:19PM -0600, Karl Williamson wrote:
>>>
>>> '/(?<![s]t)/i'
>>>
>>> does work.
>>
>> I don't think it does:
>>
>>      $ perl -wE 'qr/(?<![s]t)/i'
>>      Variable length lookbehind not implemented in regex m/(?<![s]t)/
>> at -e line 1.  $
>>
>> This however does seem to work:
>>      $ perl -wE 'qr/(?<![Ss]t)/i'
>>      $
>>
>> which is a slight improvement over the suggestion of /(?<![Ss][Tt])/
>>
>
> Ok.
>
> I have pushed 754dd7544223a129a81fe68103efea600c63a5a6 which changes
> perldiag to give more detail, including this workaround.  The patch is
> attached, for your convenience.
>
> Would changing perl518\ddelta be of any benefit?

I don't think so. They will not be rereleased.
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