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[perl #23171] Regex too selfish

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From:
perlbug-followup
Date:
July 30, 2003 06:33
Subject:
[perl #23171] Regex too selfish
Message ID:
rt-23171-61968.17.1490476418235@rt.perl.org
# New Ticket Created by  abigail@abigail.nl 
# Please include the string:  [perl #23171]
# in the subject line of all future correspondence about this issue. 
# <URL: http://rt.perl.org/rt2/Ticket/Display.html?id=23171 >



This is a bug report for perl from abigail@abigail.nl,
generated with the help of perlbug 1.34 running under perl v5.8.0.


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

While trying to help out on a problem in clpm, I encountered a
regexp bug. If I run the following program:

    print "foobarbar" =~ /^(.{3,3})(.+?)(\2+)$/ ? "Yes\n" : "No\n";
    print "foobarbar" =~ /^(.{3,4})(.+?)(\2+)$/ ? "Yes\n" : "No\n";
    print "foobarbar" =~ /^(.{3,4}?)(.+?)(\2+)$/ ? "Yes\n" : "No\n";
    print "foobarbar" =~ /^(.{2,3}?)(.+?)(\2+)$/ ? "Yes\n" : "No\n";

I get with 5.8.0 and 5.8.1-RC2 the output:

    Yes
    No
    Yes
    No

5.005, 5.6.0 and 5.6.1 however give the expected:

    Yes
    Yes
    Yes
    Yes


Abigail


[Please do not change anything below this line]
-----------------------------------------------------------------
---
Flags:
    category=core
    severity=medium
---
Site configuration information for perl v5.8.0:

Configured by camel at Mon Oct 28 01:28:45 CET 2002.

Summary of my perl5 (revision 5.0 version 8 subversion 0) 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 -Uversiononly -Dmydomain=.abigail.nl -Dcf_email=camel@abigail.nl -Dperladmin=camel@abigail.nl -Doptimize=-g -Dusemorebits -Dusedevel -Dusenm=false -Dprefix=/opt/perl -Dcc=gcc'
    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 -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64',
    optimize='-g',
    cppflags='-DDEBUGGING -fno-strict-aliasing'
    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 -lc -lcrypt -lutil
    perllibs=-lnsl -ldl -lm -lc -lcrypt -lutil
    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='-rdynamic'
    cccdlflags='-fpic', lddlflags='-shared -L/usr/local/lib'

Locally applied patches:
    

---
@INC for perl v5.8.0:
    /home/abigail/Perl
    /home/abigail/Sybase
    /opt/perl/lib/5.8.0/i686-linux-64int-ld
    /opt/perl/lib/5.8.0
    /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 v5.8.0:
    HOME=/home/abigail
    LANG=C
    LANGUAGE (unset)
    LD_LIBRARY_PATH=/home/abigail/Lib:/usr/local/lib:/usr/lib:/lib:/usr/X11R6/lib:/opt/gnome/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:/opt/povray/bin:/opt/gnome/bin:/opt/opera/bin:/usr/share/texmf/bin:/opt/Acrobat/bin:/opt/java/blackdown/j2sdk1.3.1/bin:/usr/local/games/bin:/opt/gnuplot/bin:/opt/mysql/bin
    PERL5LIB=/home/abigail/Perl:/home/abigail/Sybase
    PERLDIR=/opt/perl
    PERL_BADLANG (unset)
    SHELL=/bin/bash


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