[perl #59792] Cannot recurse inside (?|)

[Abigail (via RT) <perlbug-followup@perl.org>]

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# Please include the string:  [perl #59792]
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# <URL: http://rt.perl.org/rt3/Ticket/Display.html?id=59792 >



This is a bug report for perl from abigail@abigail.be,
generated with the help of perlbug 1.36 running under perl 5.10.0.


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[Please enter your report here]

While working the new generation of Regexp::Common, I encountered
the following problem (reduced to a minimal example):

    my $re = '(?<U><(?&U)?>)';  # Pattern matching X <'s followed by X >'s
    say "<<>>" =~ /(?:$re)/ ? "ok" : "not ok";  # ok
    say "<<>>" =~ /(?|$re)/ ? "ok" : "not ok";  # Compile error

That is, when using (?|) you cannot make a backreference. The problem
isn't restricted to recursion, or named captures. A regular numbered
backreference fails as well:

    say "!!" =~ /(?:(!)\1)/ ? "ok" : "not ok";  # Ok
    say "!!" =~ /(?|(!)\1)/ ? "ok" : "not ok";  # Compile error


The error I get is:

    Reference to nonexistent group in regex; marked by <-- HERE in m/(?|(?<A><(?&A)<-- HERE ?>))/


[Please do not change anything below this line]
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Flags:
    category=core
    severity=high
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Site configuration information for perl 5.10.0:

Configured by abigail at Sat Dec 22 18:46:30 CET 2007.

Summary of my perl5 (revision 5 version 10 subversion 0) configuration:
  Platform:
    osname=linux, osvers=2.6.11-1.1369_fc4smp, archname=i686-linux-64int-ld
    uname='linux almanda 2.6.11-1.1369_fc4smp #1 smp thu jun 2 23:08:39 edt 2005 i686 i686 i386 gnulinux '
    config_args='-des -Dusemorebits -Uversiononly -Dmydomain=.abigail.be -Dcf_email=abigail@abigail.be -Dperladmin=abigail@abigail.be -Doptimize=-g -Dcc=gcc -Dprefix=/opt/perl -Dusemorebits'
    hint=recommended, useposix=true, d_sigaction=define
    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 -I/usr/include/gdbm',
    optimize='-g',
    cppflags='-DDEBUGGING -fno-strict-aliasing -pipe -I/usr/local/include -I/usr/include/gdbm'
    ccversion='', gccversion='4.0.2 20051125 (Red Hat 4.0.2-8)', 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 -lgdbm -ldb -ldl -lm -lcrypt -lutil -lc
    perllibs=-lnsl -ldl -lm -lcrypt -lutil -lc
    libc=/lib/libc-2.3.5.so, so=so, useshrplib=false, libperl=libperl.a
    gnulibc_version='2.3.5'
  Dynamic Linking:
    dlsrc=dl_dlopen.xs, dlext=so, d_dlsymun=undef, ccdlflags='-Wl,-E'
    cccdlflags='-fPIC', lddlflags='-shared -g -L/usr/local/lib'

Locally applied patches:
    

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@INC for perl 5.10.0:
    /home/abigail/Perl
    /opt/perl/lib/5.10.0/i686-linux-64int-ld
    /opt/perl/lib/5.10.0
    /opt/perl/lib/site_perl/5.10.0/i686-linux-64int-ld
    /opt/perl/lib/site_perl/5.10.0
    /opt/perl/lib/site_perl/5.8.8
    /opt/perl/lib/site_perl
    .

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Environment for perl 5.10.0:
    HOME=/home/abigail
    LANG=en_US.UTF-8
    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:/opt/git/bin
    PERL5LIB=/home/abigail/Perl
    PERLDIR=/opt/perl
    PERL_BADLANG (unset)
    SHELL=/bin/bash

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Follow-Ups from:

Abigail <abigail@abigail.be>

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