[perl #60344] Regex lookbehind failure after an (if)then|else in perl 5.10

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

# New Ticket Created by  Adam 
# Please include the string:  [perl #60344]
# in the subject line of all future correspondence about this issue. 
# <URL: http://rt.perl.org/rt3/Ticket/Display.html?id=60344 >


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


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When using any type of lookbehind after an (if)then|else, the lookbehind
fails in perl 5.10.

I have verified this using ActiveState's perl versions 5.8.8 and 5.10.0 as
well as red hat's distributions of perl (both 5.8 and 5.10).

A simple test case listed below:

perl -e '$t = q{sql_processed.csv}; print qq{broken\n}  if  $t =~
m{\A(?(?=db2)db2|\D+)(?<!processed)\.csv\z}xms;'

5.8  OUTPUT = q{}
5.10 OUTPUT = q{broken}



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

Configured by SYSTEM at Tue May 13 16:52:25 2008.

Summary of my perl5 (revision 5 version 10 subversion 0) configuration:
  Platform:
    osname=MSWin32, osvers=5.00, archname=MSWin32-x86-multi-thread
    uname=''
    config_args='undef'
    hint=recommended, useposix=true, d_sigaction=undef
    useithreads=define, usemultiplicity=define
    useperlio=define, d_sfio=undef, uselargefiles=define, usesocks=undef
    use64bitint=undef, use64bitall=undef, uselongdouble=undef
    usemymalloc=n, bincompat5005=undef
  Compiler:
    cc='cl', ccflags ='-nologo -GF -W3 -MD -Zi -DNDEBUG -O1 -DWIN32
-D_CONSOLE -DNO_STRICT -DHAVE_DES_FCRYPT -DUSE_SITECUSTOMIZE
-DPRIVLIB_LAST_IN_INC -DPERL_IMPLICIT_CONTEXT -DPERL_IMPLICIT_SYS
-DUSE_PERLIO -DPERL_MSVCRT_READFIX',
    optimize='-MD -Zi -DNDEBUG -O1',
    cppflags='-DWIN32'
    ccversion='12.00.8804', gccversion='', gccosandvers=''
    intsize=4, longsize=4, ptrsize=4, doublesize=8, byteorder=1234
    d_longlong=undef, longlongsize=8, d_longdbl=define, longdblsize=10
    ivtype='long', ivsize=4, nvtype='double', nvsize=8, Off_t='__int64',
lseeksize=8
    alignbytes=8, prototype=define
  Linker and Libraries:
    ld='link', ldflags ='-nologo -nodefaultlib -debug -opt:ref,icf
-libpath:"C:\Perl\lib\CORE"  -machine:x86'
    libpth=\lib
    libs=  oldnames.lib kernel32.lib user32.lib gdi32.lib winspool.lib
comdlg32.lib advapi32.lib shell32.lib ole32.lib oleaut32.lib  netapi32.lib
uuid.lib ws2_32.lib mpr.lib winmm.lib  version.lib odbc32.lib odbccp32.lib
msvcrt.lib
    perllibs=  oldnames.lib kernel32.lib user32.lib gdi32.lib winspool.lib
comdlg32.lib advapi32.lib shell32.lib ole32.lib oleaut32.lib  netapi32.lib
uuid.lib ws2_32.lib mpr.lib winmm.lib  version.lib odbc32.lib odbccp32.lib
msvcrt.lib
    libc=msvcrt.lib, so=dll, useshrplib=true, libperl=perl510.lib
    gnulibc_version=''
  Dynamic Linking:
    dlsrc=dl_win32.xs, dlext=dll, d_dlsymun=undef, ccdlflags=' '
    cccdlflags=' ', lddlflags='-dll -nologo -nodefaultlib -debug
-opt:ref,icf  -libpath:"C:\Perl\lib\CORE"  -machine:x86'

Locally applied patches:
    ACTIVEPERL_LOCAL_PATCHES_ENTRY
    33741 avoids segfaults invoking S_raise_signal() (on Linux)
    33763 Win32 process ids can have more than 16 bits
    32809 Load 'loadable object' with non-default file extension
    32728 64-bit fix for Time::Local

---
@INC for perl 5.10.0:
    C:/Perl/site/lib
    C:/Perl/lib
    .

---
Environment for perl 5.10.0:
    HOME (unset)
    LANG (unset)
    LANGUAGE (unset)
    LD_LIBRARY_PATH (unset)
    LOGDIR (unset)
    PATH=C:\Program Files\ActiveState Komodo Edit 5\;C:\Program
Files\Java\jre1.6.0_07\bin;C:\oracle\ora92\bin\;C:\Program
Files\Oracle\jre\1.3.1\bin\;C:\Program
Files\Oracle\jre\1.1.8\bin\;C:\Perl\site\bin;C:\Perl\bin;C:\WINNT\system32;C:\WINNT;C:\WINNT\System32\Wbem;C:\Program
Files\Diskeeper Corporation\Diskeeper\;C:\Program
Files\Hewlett-Packard\OpenView\service desk 4.5\client\bin;C:\Program
Files\IDM Computer
Solutions\UltraEdit-32\;C:\WINNT\system32\WindowsPowerShell\v1.0
    PERL_BADLANG (unset)
    SHELL (unset)

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Follow-Ups from:

andreas.koenig.7os6VVqR@franz.ak.mind.de (Andreas J. Koenig)
demerphq <demerphq@gmail.com>

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