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From: "vincent-srcware at vinc17 dot net"
 <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sourceware.org
Subject: [Bug regex/17356] regex assertion violation with triple
 backreferences
Date: Thu, 08 Sep 2022 12:36:00 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D17356

Vincent Lef=C3=A8vre <vincent-srcware at vinc17 dot net> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |vincent-srcware at vinc17 =
dot net

--- Comment #4 from Vincent Lef=C3=A8vre <vincent-srcware at vinc17 dot net=
> ---
(In reply to eggert from comment #3)
> Apparently I was incorrect when I wrote that this was a duplicate of
> Bug#11053 as that other bug is fixed but this one is not.

More precisely, the assertion violation was Bug#11053, which is fixed in gl=
ibc
2.35, but the test now fails: it gives no matches, while there should be a
match, since the regexp matches the empty string.

Test with grep:

vinc17@gcc92:~$ echo 'a' | grep -E '(.{0,1})(.{0,1})\2\1'
a
vinc17@gcc92:~$ echo 'a' | grep -E '(.{0,1})(.{0,1})(.{0,1})\3\2\1'
vinc17@gcc92:~$=20

(with only 2 backreferences, this is OK, but not with 3).

The bug could be retitled.

--=20
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