[ID 19991110.002] minimal matching discrepancy found by pcre author

This is a bug report for perl from jhi@mimosa.hut.fi,
generated with the help of perlbug 1.27 running under perl 5.00562.


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[Please enter your report here]

The author of the PCRE (Perl-Compatible Regular Expressions)
(ftp://ftp.cus.cam.ac.uk/pub/software/programs/pcre/), Philip Hazel,
has noticed the following oddity in Perl (back in 5.005_02, but it
still seems to be present).  Surely the below examples should work
similarly (the second one should print "bb")?

./perl -wle '"aba" =~ /^(a(b)?)+$/;print $2'
b

./perl -wle '"aabbaa" =~ /^(aa(bb)?)+$/;print $2'
Use of uninitialized value at -e line 1.

[Please do not change anything below this line]
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Site configuration information for perl 5.00562:

Configured by jhi at Wed Nov 10 01:04:17 EET 1999.

Summary of my perl5 (revision 5.0 version 5 subversion 62) configuration:
  Platform:
    osname=solaris, osvers=2.7, archname=sun4-solaris
    uname='sunos mimosa.hut.fi 5.7 generic_106541-05 sun4u sparc '
    config_args='-ders -Dcc=gcc'
    hint=recommended, useposix=true, d_sigaction=define
    usethreads=undef useperlio=undef d_sfio=undef
    use64bits=undef usemultiplicity=undef
  Compiler:
    cc='gcc', optimize='-O', gccversion=2.8.1
    cppflags='-DUSE_LARGE_FILES -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64'
    ccflags ='-DUSE_LARGE_FILES -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64'
    stdchar='char', d_stdstdio=define, usevfork=false
    intsize=4, longsize=4, ptrsize=4, doublesize=8
    d_longlong=define, longlongsize=8, d_longdbl=define, longdblsize=16
    alignbytes=8, usemymalloc=y, prototype=define
  Linker and Libraries:
    ld='gcc', ldflags =' '
    libpth=/lib /usr/lib /usr/ccs/lib
    libs=-lsocket -lnsl -ldl -lm -lc -lcrypt -lsec
    libc=, so=so, useshrplib=false, libperl=libperl.a
  Dynamic Linking:
    dlsrc=dl_dlopen.xs, dlext=so, d_dlsymun=undef, ccdlflags=' '
    cccdlflags='-fPIC', lddlflags='-G'

Locally applied patches:
    

---
@INC for perl 5.00562:
    lib
    /u/vieraat/vieraat/jhi/Perl/lib
    /opt/lib/perl5/5.00562/sun4-solaris
    /opt/lib/perl5/5.00562
    /opt/lib/site_perl/5.00562/sun4-solaris
    /opt/lib/site_perl
    .

---
Environment for perl 5.00562:
    HOME=/u/vieraat/vieraat/jhi
    LANG=C
    LANGUAGE (unset)
    LC_CTYPE=iso_8859_1
    LD_LIBRARY_PATH (unset)
    LOGDIR (unset)
    PATH=/u/vieraat/vieraat/jhi/.s:/p/bin:/p/adm/bin:/usr/bin:/usr/sbin:/sbin:/bin:/usr/ccs/bin:/usr/lib:/etc:/lib:/p/X6/bin:/usr/bin/X11:/usr/lib/acct:/usr/5bin:/u/vieraat/vieraat/jhi
    PERLLIB=/u/vieraat/vieraat/jhi/Perl/lib
    PERL_BADLANG (unset)
    SHELL=/bin/zsh

• [ID 19991110.002] minimal matching discrepancy found by pcre author by Jarkko Hietaniemi
• Re: [ID 19991110.002] minimal matching discrepancy found by pcre author by Ilya Zakharevich
• RE: [ID 19991110.002] minimal matching discrepancy found by pcre author by Konovalov, Vadim
• Re: [ID 19991110.002] minimal matching discrepancy found by pcre author by Greg Bacon