GNU bug report logs - #60621
grep -P does not set PCRE2_UCP

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Karl Pettersson <karl.pettersson <at> klpn.se>
To: bug-grep <bug-grep <at> gnu.org>
Subject: grep -P does not set PCRE2_UCP
Date: Fri, 6 Jan 2023 21:41:53 +0100

Hi

Using grep -P for boundary matches yields incorrect results with
non-ASCII letters:

$ echo 'Öst' | grep -P '\bs'
Öst

The output should be nothing in this case, and the culprit seems to be
this line in pcresearch.c:

      flags |= PCRE2_UTF;

If the PCRE2_UCP flag is added according to this, the program behaves
correctly:

      flags |= PCRE2_UTF|PCRE2_UCP;

The pcre2grep test program in the pcre2 has the same problem, and I
filed an issue there too:

https://github.com/PCRE2Project/pcre2/issues/185

A Twitter discussion with more examples:

https://twitter.com/gro_tsen/status/1610972356972875777

Kind regards
-- 
Karl Pettersson
Uppsala, Sverige/Sweden

https://static-dust.klpn.se/

Message #8 received at 60621 <at> debbugs.gnu.org (full text, mbox):

From: Karl Pettersson <karl.pettersson <at> klpn.se>
To: bug#60621 <60621 <at> debbugs.gnu.org>
Subject: Duplicate 0f #60618
Date: Sat, 7 Jan 2023 10:14:22 +0100

Hi

I first filed the original issue for pcre2grep after a Twitter
discussion, and then also sent it to the bug-grep list, but Carlo Arenas
had already noticed it (but it had not been registered from what I could
see), so it is a duplicate of #60618.

-- 
Karl Pettersson
Uppsala, Sverige/Sweden

https://static-dust.klpn.se/

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