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

Previous Next

Full log

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/

Previous Next

GNU bug tracking system
Copyright (C) 1999 Darren O. Benham, 1997,2003 nCipher Corporation Ltd, 1994-97 Ian Jackson.