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#41558
Regexp Bug
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sed.
(Wed, 27 May 2020 04:16:02 GMT)
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"anton.paras" <anton <at> paras.nu>:
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(Wed, 27 May 2020 04:16:02 GMT)
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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):
[Message part 1 (text/plain, inline)]
I posted to Stack Exchange, and they recommended that I file a bug. I'd rather not copy+paste it all, so here's the link:
https://unix.stackexchange.com/questions/579889/why-doesnt-this-sed-command-replace-the-3rd-to-last-and
here's an example
> echo 'dog and foo and bar and baz land good' | sed -E 's/(.*)\band\b((.*\band\b){2})/\1XYZ\2/'
expected output: dog XYZ foo and bar and baz land good
actual output: dog and foo XYZ bar and baz land good
here's my sed --version output: sed (GNU sed) 4.2.2
I hope this is helpful, cheers!
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(Thu, 28 May 2020 06:30:02 GMT)
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Message #8 received at 41558 <at> debbugs.gnu.org (full text, mbox):
On Tue, 26 May 2020 21:14:12 -0700
"anton.paras" <anton <at> paras.nu> wrote:
> I posted to Stack Exchange, and they recommended that I file a bug. I'd rather not copy+paste it all, so here's the link:
>
>
>
> https://unix.stackexchange.com/questions/579889/why-doesnt-this-sed-command-replace-the-3rd-to-last-and
>
>
>
> here's an example
>
>
>
> > echo 'dog and foo and bar and baz land good' |??? sed -E 's/(.*)\band\b((.*\band\b){2})/\1XYZ\2/'
>
>
>
> expected output:?dog XYZ foo and bar and baz land good
>
> actual output:?dog and foo XYZ bar and baz land good
>
>
> here's my sed --version output:?sed (GNU sed) 4.2.2
>
>
>
> I hope this is helpful, cheers!
$ echo 'foo and bar land' | env LC_ALL=en_US.utf8 sed -nE '/(.*\band){2}/p'
foo and bar land
$ echo 'foo and bar land' | env LC_ALL=en_US.utf8 sed -nE '/.*\band.*\band/p'
$
It seems that there is the bug in regex.
expected:
$ echo 'foo and bar land' | env LC_ALL=en_US.utf8 sed -nE '/(.*\band){2}/p'
$ echo 'foo and bar land' | env LC_ALL=en_US.utf8 sed -nE '/.*\band.*\band/p'
$
It also reproduces in grep.
$ echo 'foo and bar land' | env LC_ALL=en_US.utf8 grep -E '(.*\band){2}'
foo and bar land
$ echo 'foo and bar land' | env LC_ALL=en_US.utf8 grep -E '.*\band.*\band'
$
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sed.
(Tue, 22 Sep 2020 23:41:02 GMT)
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Message #11 received at 41558 <at> debbugs.gnu.org (full text, mbox):
On Wed, May 27, 2020 at 11:30 PM Norihiro Tanaka <noritnk <at> kcn.ne.jp> wrote:
> On Tue, 26 May 2020 21:14:12 -0700
> "anton.paras" <anton <at> paras.nu> wrote:
>
> > I posted to Stack Exchange, and they recommended that I file a bug. I'd rather not copy+paste it all, so here's the link:
> >
> >
> >
> > https://unix.stackexchange.com/questions/579889/why-doesnt-this-sed-command-replace-the-3rd-to-last-and
> >
> >
> >
> > here's an example
> >
> >
> >
> > > echo 'dog and foo and bar and baz land good' |??? sed -E 's/(.*)\band\b((.*\band\b){2})/\1XYZ\2/'
> >
> >
> >
> > expected output:?dog XYZ foo and bar and baz land good
> >
> > actual output:?dog and foo XYZ bar and baz land good
> >
> >
> > here's my sed --version output:?sed (GNU sed) 4.2.2
> >
> >
> >
> > I hope this is helpful, cheers!
>
> $ echo 'foo and bar land' | env LC_ALL=en_US.utf8 sed -nE '/(.*\band){2}/p'
> foo and bar land
> $ echo 'foo and bar land' | env LC_ALL=en_US.utf8 sed -nE '/.*\band.*\band/p'
> $
>
> It seems that there is the bug in regex.
>
> expected:
> $ echo 'foo and bar land' | env LC_ALL=en_US.utf8 sed -nE '/(.*\band){2}/p'
> $ echo 'foo and bar land' | env LC_ALL=en_US.utf8 sed -nE '/.*\band.*\band/p'
> $
>
> It also reproduces in grep.
>
> $ echo 'foo and bar land' | env LC_ALL=en_US.utf8 grep -E '(.*\band){2}'
> foo and bar land
> $ echo 'foo and bar land' | env LC_ALL=en_US.utf8 grep -E '.*\band.*\band'
> $
I agree that this looks like a regex bug. This should print nothing:
echo 'foo and bar land' | env LC_ALL=en_US.utf8 sed -nE '/(.*\band){2}/p'
just as this already does:
echo 'foo and bar land' | env LC_ALL=C sed -nE '/(.*\band){2}/p'
Does anyone know if there's a glibc bug number for it?
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(Wed, 23 Sep 2020 00:41:01 GMT)
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Message #14 received at 41558 <at> debbugs.gnu.org (full text, mbox):
On 9/22/20 4:40 PM, Jim Meyering wrote:
> Does anyone know if there's a glibc bug number for it?
I looked for one and didn't find it, so I created glibc bug 26653 for it. See:
https://sourceware.org/bugzilla/show_bug.cgi?id=26653
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(Wed, 23 Sep 2020 02:05:02 GMT)
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Message #17 received at 41558 <at> debbugs.gnu.org (full text, mbox):
On Tue, Sep 22, 2020 at 5:40 PM Paul Eggert <eggert <at> cs.ucla.edu> wrote:
> On 9/22/20 4:40 PM, Jim Meyering wrote:
> > Does anyone know if there's a glibc bug number for it?
>
> I looked for one and didn't find it, so I created glibc bug 26653 for it. See:
>
> https://sourceware.org/bugzilla/show_bug.cgi?id=26653
Nice! Thank you!
This bug report was last modified 4 years and 62 days ago.
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