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From: "dpmendenhall at gmail dot com" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs-regex@sourceware.org
Subject: [Bug regex/25814] Consecutive + operators accepted but have no
 effect except consuming more memory
Date: Mon, 13 Apr 2020 02:59:57 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D25814

--- Comment #4 from David Mendenhall <dpmendenhall at gmail dot com> ---
> RE_CONTEXT_INVALID_DUP is only part of RE_SYNTAX_POSIX_BASIC, but not RE_=
SYNTAX_POSIX_EXTENDED

The same behavior is reproducible with basic syntax. See regex-basic.c
attached.

$ gcc -o regex-basic regex-basic.c
$ ./regex-basic 0\\+ 0
pattern: 0\+
string: 0

regex matched
$ ./regex-basic 0\\+\\+ 0
pattern: 0\+\+
string: 0

regex matched
./regex-basic
0\\+\\+\\+\\+\\+\\+\\+\\+\\+\\+\\+\\+\\+\\+\\+\\+\\+\\+\\+\\+\\+\\+\\+\\+\\=
+\\+\\+\\+\\+\\+\\+\\+\\+\\+
0
pattern: 0\+\+\+\+\+\+\+\+\+\+\+\+\+\+\+\+\+\+\+\+\+\+\+\+\+\+\+\+\+\+\+\+\=
+\+
string: 0
<hangs consuming all system memory>

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