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[perl #56444] Perl 5.10 breaks \N{} in regex interpolated inside regex (with charnames)

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From:
Chris Pirazzi
Date:
June 29, 2008 10:55
Subject:
[perl #56444] Perl 5.10 breaks \N{} in regex interpolated inside regex (with charnames)
Message ID:
rt-3.6.HEAD-18542-1214725107-225.56444-75-0@perl.org
# New Ticket Created by  "Chris Pirazzi" 
# Please include the string:  [perl #56444]
# in the subject line of all future correspondence about this issue. 
# <URL: http://rt.perl.org/rt3/Ticket/Display.html?id=56444 >


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


-----------------------------------------------------------------
Perl 5.10 (ActiveState ActivePerl Build 1003) breaks the following
script, as compared with Perl 5.8.8 (ActiveState ActivePerl Build
822):

use utf8;
use strict;
use English qw( -no_match_vars );
use charnames ':full';
my $r1 = qr/\N{THAI CHARACTER SARA I}/;
my $s1 = "foo";
$s1 =~ /$r1+/;

The problem is that the last line errs with:

Constant(\N{THAI CHARACTER SARA I}) unknown: (possibly a missing "use
charnames...") in regex; marked by <-- HERE in m/(?-xism:\N{THAI
CHARACTER SARA I} <-- HERE )+/ at t.pl line 7.

Note that I did use 'charnames' and that the \N{} DOES work in the first regex.
The err is in line 7, the last line, where the correctly compiled
regex gets re-interpolated.

In Perl 5.8.8, this script runs without error and the regex works as expected.

I did a bunch of google searches but could not find mention of this.

This might be related, but it is very old:

http://groups.google.co.th/group/perl.perl5.changes/browse_thread/thread/8a1489441e6e248/835a4e9963ac2011?lnk=st&q=perl+bug+%5CN+missing+charnames#835a4e9963ac2011

A workaround is:

my $a = "\N{THAI CHARACTER SARA I}";
my $r1 = qr/$a/;
$s1 =~ /$r1+/;

however this is quite inconvenient as I have hundreds of regexes that
need change!

Thanks.
-----------------------------------------------------------------
---
Flags:
    category=core
    severity=medium
---
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='14.0.50727', 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=c:\
    LANG (unset)
    LANGUAGE (unset)
    LD_LIBRARY_PATH (unset)
    LOGDIR (unset)
    PATH=C:\perl\bin;C:\tcl\bin;c:\mysql\bin;C:\WINDOWS\system32;C:\WINDOWS;C:\WINDOWS\System32\Wbem;C:\Program
Files\Common Files\Roxio
Shared\DLLShared;C:\s\Common7\IDE;C:\s\VC\BIN;C:\s\Common7\Tools;C:\s\Common7\Tools\bin;C:\s\VC\PlatformSDK\bin;C:\s\SDK\v2.0\bin;C:\WINDOWS\Microsoft.NET\Framework\v2.0.50727;C:\s\VC\VCPackages;c:\cygwin\bin;c:\cygwin\usr\X11R6\bin;c:\cygwin\usr\local\bin;c:\bin;c:\stlport\STLport-5.1.5\bin;c:\icu\icu-3.4.1\bin;;C:\graphviz\Graphviz\bin;c:\doxygen\bin;C:\quicktime\QTSystem\
    PERL_BADLANG (unset)
    SHELL=c:\cygwin\bin\zsh.exe


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