bug#22655: grep-2.21 (and git master): --null-data and ranges work in an odd way (-P works fine)

[Jim Meyering]

On Sat, Feb 20, 2016 at 8:19 PM, Jim Meyering <address@hidden> wrote:
...
>> The bug also present with PCRE engine:
>>
>>    $ printf '12\n34\0' | LC_ALL=en_US.utf-8 grep -z -P '^[1234]*$' | wc -c
>>    6
>>    $ printf '12\n34\0' | LC_ALL=en_US.utf-8 grep -z -P '^[1-4]*$' | wc -c
>>    6
>
> Thank you for the analysis and the report.
> I have fixed the regex-oriented problem with the attached
> patch, but not yet the case using -P -z (PCRE + --null-data):

FTR, I've also pushed the attached test-improving patch:

0001-tests-convert-cmd-fail-1-to-returns_-1-cmd-fail-1.patch
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