[Bug 978233] New: perl-5.18: Regex \8 and \9 after literals no longer work

[Red Hat Bugzilla]

https://bugzilla.redhat.com/show_bug.cgi?id=978233

            Bug ID: 978233
           Summary: perl-5.18: Regex \8 and \9 after literals no longer
                    work
           Product: Fedora
           Version: rawhide
         Component: perl
          Severity: unspecified
          Priority: unspecified
          Assignee: mmaslano(a)redhat.com
          Reporter: ppisar(a)redhat.com
        QA Contact: extras-qa(a)fedoraproject.org
                CC: cweyl(a)alumni.drew.edu, iarnell(a)gmail.com,
                    jplesnik(a)redhat.com, kasal(a)ucw.cz, lkundrak(a)v3.sk,
                    mmaslano(a)redhat.com,
                    perl-devel(a)lists.fedoraproject.org, ppisar(a)redhat.com,
                    psabata(a)redhat.com, rc040203(a)freenet.de,
                    tcallawa(a)redhat.com

There is a regression about \8 and \9 back-references not working since
v5.17.0-543-g726ee55. This has been somewhat fixed with:

commit f1e1b256c5c1773d90e828cca6323c53fa23391b
Author: Yves Orton <demerphq(a)gmail.com&gt;
Date:   Tue Jun 25 21:01:27 2013 +0200

    Fix rules for parsing numeric escapes in regexes

    Commit 726ee55d introduced better handling of things like \87 in a
    regex, but as an unfortunate side effect broke latex2html.

    The rules for handling backslashes in regexen are a bit arcane.

    Anything starting with \0 is octal.

    The sequences \1 through \9 are always backrefs.

    Any other sequence is interpreted as a decimal, and if there
    are that many capture buffers defined in the pattern at that point
    then the sequence is a backreference. If however it is larger
    than the number of buffers the sequence is treated as an octal digit.

    A consequence of this is that \118 could be a backreference to
    the 118th capture buffer, or it could be the string "\11" . "8".
In
    other words depending on the context we might even use a different
    number of digits for the escape!

    This also left an awkward edge case, of multi digit sequences
    starting with 8 or 9 like m/\87/ which would result in us parsing
    as though we had seen /87/ (iow a null byte at the start) or worse
    like /\x{00}87/ which is clearly wrong.

    This patches fixes the cases where the capture buffers are defined,
    and causes things like the \87 or \97 to throw the same error that
    /\8/ would. One might argue we should complain about an illegal
    octal sequence, but this seems more consistent with an error like
    /\9/ and IMO will be less surprising in an error message.

    This patch includes exhaustive tests of patterns of the form
    /(a)\1/, /((a))\2/ etc, so that we dont break this again if we
    change the logic more.

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[Bug 978233] perl-5.18: Regex \8 and \9 after literals no longer work

[Red Hat Bugzilla]

https://bugzilla.redhat.com/show_bug.cgi?id=978233

Fedora Admin XMLRPC Client <fedora-admin-xmlrpc(a)redhat.com&gt; changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Assignee|mmaslano(a)redhat.com         |jplesnik(a)redhat.com



--- Comment #1 from Fedora Admin XMLRPC Client <fedora-admin-xmlrpc(a)redhat.com&gt; ---
This package has changed ownership in the Fedora Package Database.  Reassigning
to the new owner of this component.

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[Bug 978233] perl-5.18: Regex \8 and \9 after literals no longer work

[Red Hat Bugzilla]

https://bugzilla.redhat.com/show_bug.cgi?id=978233

Jaroslav Škarvada <jskarvad(a)redhat.com&gt; changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Blocks|                            |991957, 992012
                 CC|                            |negativo17(a)gmail.com



--- Comment #2 from Jaroslav Škarvada <jskarvad(a)redhat.com&gt; ---
*** Bug 994883 has been marked as a duplicate of this bug. ***

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[Bug 978233] perl-5.18: Regex \8 and \9 after literals no longer work

[Red Hat Bugzilla]

https://bugzilla.redhat.com/show_bug.cgi?id=978233

Jaroslav Škarvada <jskarvad(a)redhat.com&gt; changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |jskarvad(a)redhat.com



--- Comment #3 from Jaroslav Škarvada <jskarvad(a)redhat.com&gt; ---
Please apply the patch from the commit f1e1b256c5c1773d90e828cca6323c53fa23391b
mentioned in the comment 0, several packages started failing to build due to
broken latex2html (e.g. bug 994883). The patch needs only trivial changes to
apply cleanly.

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[Bug 978233] perl-5.18: Regex \8 and \9 after literals no longer work

[Red Hat Bugzilla]

https://bugzilla.redhat.com/show_bug.cgi?id=978233



--- Comment #4 from Fedora Update System <updates(a)fedoraproject.org&gt; ---
perl-5.18.1-288.fc20 has been submitted as an update for Fedora 20.
https://admin.fedoraproject.org/updates/perl-5.18.1-288.fc20

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[Bug 978233] perl-5.18: Regex \8 and \9 after literals no longer work

[Red Hat Bugzilla]

https://bugzilla.redhat.com/show_bug.cgi?id=978233

Fedora Update System <updates(a)fedoraproject.org&gt; changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|MODIFIED                    |ON_QA



--- Comment #5 from Fedora Update System <updates(a)fedoraproject.org&gt; ---
Package perl-5.18.1-288.fc20:
* should fix your issue,
* was pushed to the Fedora 20 testing repository,
* should be available at your local mirror within two days.
Update it with:
# su -c 'yum update --enablerepo=updates-testing perl-5.18.1-288.fc20'
as soon as you are able to.
Please go to the following url:
https://admin.fedoraproject.org/updates/FEDORA-2013-16400/perl-5.18.1-288...
then log in and leave karma (feedback).

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[Bug 978233] perl-5.18: Regex \8 and \9 after literals no longer work

[Red Hat Bugzilla]

https://bugzilla.redhat.com/show_bug.cgi?id=978233

Fedora Update System <updates(a)fedoraproject.org&gt; changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|ON_QA                       |CLOSED
   Fixed In Version|                            |perl-5.18.1-288.fc20
         Resolution|---                         |ERRATA
        Last Closed|                            |2013-09-22 19:57:34



--- Comment #7 from Fedora Update System <updates(a)fedoraproject.org&gt; ---
perl-5.18.1-288.fc20 has been pushed to the Fedora 20 stable repository.  If
problems still persist, please make note of it in this bug report.

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