Re: [PATCH] rebase -i: Fix possibly wrong onto hash in todo

From: Junio C Hamano <gitster@pobox.com>
Date: Aug 12, 2020, 19:40 UTC
Message-ID: <xmqqpn7v64bx.fsf@gitster.c.googlers.com>
In-Reply-To: <20200812140352.GC74542@syl.lan>

Taylor Blau <me@ttaylorr.com> writes:

Show 12 quoted lines

> *Grumble*, it's not anywhere in POSIX:
>
>   https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap09.html
>
> ...making this a GNU-ism.
>
>> Look for "stick to a subset of BRE" in Documention/CodingGuidelines;
>> we may need to update the document to raise the baseline to match
>> the reality of year 2020, though.
>
> So, I think the "reality of year 2020" is that we still write '..*'
> instead of '.\+'.

Another interesting thing I found is this piece in "man sed" on Linux (hence GNU):

    REGULAR EXPRESSIONS
           ...
           The -E option switches to using extended regular  expressions  instead;
           it  has  been  supported  for  years by GNU sed, and is now included in
           POSIX.

But the "sed" documentation [*1*] that matches what you cited above (The Open Group Base Specifications Issue 7, 2018 edition) does not mention "-E", "-r" nor "--regexp-extended".

[Reference]

*1* https://pubs.opengroup.org/onlinepubs/9699919799/utilities/sed.html#tag_20_116_02