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[perl #37688] Unexpected regex failure.

From: "abigail@abigail.nl (via RT)" <perlbug-followup@perl.org>
Reply-To: perl5-porters@perl.org
To: bugs-bitbucket@netlabs.develooper.com
Date: Tue, 15 Nov 2005 15:12:46 -0800
Message-ID: <rt-3.0.11-37688-124523.11.548294042002@perl.org>

# New Ticket Created by  abigail@abigail.nl 
# Please include the string:  [perl #37688]
# in the subject line of all future correspondence about this issue. 
# <URL: https://rt.perl.org/rt3/Ticket/Display.html?id=37688 >



This is a bug report for perl from abigail@abigail.nl,
generated with the help of perlbug 1.35 running under perl v5.8.7.


-----------------------------------------------------------------
[Please enter your report here]

    #!/usr/bin/perl

    use strict;
    use warnings;

    $_ = "A B";
    print /^(.)\s+.(?(1))/   ? "match\n" : "no match\n";
    print /^(.)\s+.$(?(1))/  ? "match\n" : "no match\n";
    print /^(.)\s+.(?(1))$/  ? "match\n" : "no match\n";
    print /^(.)\s+.$(?(1))$/ ? "match\n" : "no match\n";
    print /^(.)\s.$(?(1))/   ? "match\n" : "no match\n";
    __END__
    match
    no match
    match
    match
    match

I would have expected that all the cases matched. This behaviour first
happened in 5.6.0, and persists in 5.9.2. With 5.005 and 5.005_04, I
get 'match' five times, as expected.

Replacing the conditional '(?(1))' with another conditional still causes
non matching of the second regex. But a different placement of $ (or an
extra $), or replacing \s+ with \s makes the regex match. Removing the
parenthesis (and replacing the conditional with another conditional that's
always true) makes that the regex matches as well.


[Please do not change anything below this line]
-----------------------------------------------------------------
---
Flags:
    category=core
    severity=low
---
Site configuration information for perl v5.8.7:

Configured by abigail at Wed Jun  1 21:50:09 CEST 2005.

Summary of my perl5 (revision 5 version 8 subversion 7) configuration:
  Platform:
    osname=linux, osvers=2.4.18-bf2.4, archname=i686-linux-64int-ld
    uname='linux alexandra 2.4.18-bf2.4 #1 son apr 14 09:53:28 cest 2002 i686 unknown '
    config_args='-des -Dusemorebits -Uversiononly -Dmydomain=.abigail.nl -Dcf_email=abigail@abigail.nl -Dperladmin=abigail@abigail.nl -Doptimize=-g -Dcc=gcc -Dprefix=/opt/perl'
    hint=recommended, useposix=true, d_sigaction=define
    usethreads=undef use5005threads=undef useithreads=undef usemultiplicity=undef
    useperlio=define d_sfio=undef uselargefiles=define usesocks=undef
    use64bitint=define use64bitall=undef uselongdouble=define
    usemymalloc=n, bincompat5005=undef
  Compiler:
    cc='gcc', ccflags ='-DDEBUGGING -fno-strict-aliasing -pipe -I/usr/local/include -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64',
    optimize='-g',
    cppflags='-DDEBUGGING -fno-strict-aliasing -pipe -I/usr/local/include'
    ccversion='', gccversion='3.0.4', gccosandvers=''
    intsize=4, longsize=4, ptrsize=4, doublesize=8, byteorder=12345678
    d_longlong=define, longlongsize=8, d_longdbl=define, longdblsize=12
    ivtype='long long', ivsize=8, nvtype='long double', nvsize=12, Off_t='off_t', lseeksize=8
    alignbytes=4, prototype=define
  Linker and Libraries:
    ld='gcc', ldflags =' -L/usr/local/lib'
    libpth=/usr/local/lib /lib /usr/lib
    libs=-lnsl -ldl -lm -lcrypt -lutil -lc
    perllibs=-lnsl -ldl -lm -lcrypt -lutil -lc
    libc=/lib/libc-2.2.5.so, so=so, useshrplib=false, libperl=libperl.a
    gnulibc_version='2.2.5'
  Dynamic Linking:
    dlsrc=dl_dlopen.xs, dlext=so, d_dlsymun=undef, ccdlflags='-Wl,-E'
    cccdlflags='-fpic', lddlflags='-shared -L/usr/local/lib'

Locally applied patches:
    no-syntax-warnings
    defined-or

---
@INC for perl v5.8.7:
    /home/abigail/Perl
    /opt/perl/lib/5.8.7/i686-linux-64int-ld
    /opt/perl/lib/5.8.7
    /opt/perl/lib/site_perl/5.8.7/i686-linux-64int-ld
    /opt/perl/lib/site_perl/5.8.7
    /opt/perl/lib/site_perl/5.8.6/i686-linux-64int-ld
    /opt/perl/lib/site_perl/5.8.6
    /opt/perl/lib/site_perl/5.8.5/i686-linux-64int-ld
    /opt/perl/lib/site_perl/5.8.5
    /opt/perl/lib/site_perl/5.8.4/i686-linux-64int-ld
    /opt/perl/lib/site_perl/5.8.4
    /opt/perl/lib/site_perl/5.8.3/i686-linux-64int-ld
    /opt/perl/lib/site_perl/5.8.3
    /opt/perl/lib/site_perl/5.8.2/i686-linux-64int-ld
    /opt/perl/lib/site_perl/5.8.2
    /opt/perl/lib/site_perl/5.8.1/i686-linux-64int-ld
    /opt/perl/lib/site_perl/5.8.1
    /opt/perl/lib/site_perl/5.8.0/i686-linux-64int-ld
    /opt/perl/lib/site_perl/5.8.0
    /opt/perl/lib/site_perl
    .

---
Environment for perl v5.8.7:
    HOME=/home/abigail
    LANG=C
    LANGUAGE (unset)
    LD_LIBRARY_PATH=/home/abigail/Lib:/usr/local/lib:/usr/lib:/lib:/usr/X11R6/lib
    LOGDIR (unset)
    PATH=/home/abigail/Bin:/opt/perl/bin:/usr/local/bin:/usr/local/X11/bin:/usr/bin:/bin:/usr/local/sbin:/usr/sbin:/sbin:/usr/X11R6/bin:/usr/games:/usr/share/texmf/bin:/opt/Acrobat/bin:/opt/java/blackdown/j2sdk1.3.1/bin:/usr/local/games/bin
    PERL5LIB=/home/abigail/Perl
    PERLDIR=/opt/perl
    PERL_BADLANG (unset)
    SHELL=/bin/bash

Follow-Ups from:: andreas.koenig.gmwojprw@franz.ak.mind.de (Andreas J. Koenig)
hv@crypt.org

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