Re: grep: fix multibyte regex handling under macOS (1819ad327b7a1f19540a819813b70a0e8a7f798f)

From: Junio C Hamano <gitster@pobox.com>
Date: Feb 1, 2023, 18:54 UTC
Message-ID: <xmqqsffpz05o.fsf@gitster.g>
In-Reply-To: <CANgJU+WZR56xG+KL3P053aD_qTh+rBhZ01mqNajg2qRt_+RNMA@mail.gmail.com>

demerphq <demerphq@gmail.com> writes:

> ... I saw some discussion
> recently that the mac regex engine doesn't play nicely in certain
> ways, but i dont recollect the details.

There was a discussion on BRE having and not having GNU-like extension on macOS, in this thread

  https://lore.kernel.org/git/26a0d4ca-3d97-ace4-1a1f-92b1ee6715a6@web.de/

The patch we ended up using avoids touching the behaviour with ERE, as REG_ENHANCED on macOS affects REG_EXTENDED, but the issue we were looking at in the thread was about BRE.