From: Florian Weimer <fw@deneb.enyo.de>
To: "liheng \(P\)" <liheng40@huawei.com>
Cc: Szabolcs Nagy <nsz@port70.net>,
"musl\@lists.openwall.com" <musl@lists.openwall.com>,
Rich Felker <dalias@libc.org>,
"Xiangrui \(Euler\)" <rui.xiang@huawei.com>,
Lizefan <lizefan@huawei.com>
Subject: Re: [musl] regex Back reference matching result not same as glibc and tre.
Date: Sun, 19 Apr 2020 15:10:34 +0200 [thread overview]
Message-ID: <871roj1v05.fsf@mid.deneb.enyo.de> (raw)
In-Reply-To: <6D612B6AC5DCDA4580AF97B1068118AD2DD415@DGGEML501-MBX.china.huawei.com> (liheng's message of "Sun, 19 Apr 2020 12:26:58 +0000")
* liheng:
> But my point is that why pat[] = "(.?).?\\1" to match "aba" in
> extended regular expression mode that success in glibc and failed in
> musl? Are musl-regex and glibc-regex different?
They are different. Nowadays, accepting backreferences for extended
regular expressions is probably a bug: it prevents certain strategies
for implementing regular expressions because they are not, in fact,
regular.
The glibc implementation is problematic for several reasons. I cannot
recommend to use it as a reference.
next prev parent reply other threads:[~2020-04-19 13:10 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-04-18 8:44 liheng (P)
2020-04-18 10:28 ` Florian Weimer
2020-04-18 11:07 ` liheng (P)
2020-04-18 11:13 ` Szabolcs Nagy
2020-04-18 11:37 ` liheng (P)
2020-04-18 14:07 ` Szabolcs Nagy
2020-04-19 12:26 ` liheng (P)
2020-04-19 13:10 ` Florian Weimer [this message]
2020-04-20 1:26 ` Rich Felker
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