[perl #78058] qr/\88/ hangs (Bleadperl breaks JE again)

# New Ticket Created by  Father Chrysostomos 
# Please include the string:  [perl #78058]
# in the subject line of all future correspondence about this issue. 
# <URL: http://rt.perl.org/rt3/Ticket/Display.html?id=78058 >


This one-liner hangs during regexp compilation:
perl5.13.5 -e 'qr/\88/'

In perl5.13.4 it compiles successfully, but qr/\9/ dies, because it is an invalid backreference.

I think the correct behaviour is for qr/\88/ to die the same way.

Note also that it does not hang if the second digit is a valid octal digit:
$ perl5.13.5 -le 'print qr/\87/'
(?-xism:\87)

This was caused by:

>From c99e91e919b4bb89bab7829a9026ee01b1fff2a1 Mon Sep 17 00:00:00 2001
From: Karl Williamson <khw@khw-desktop.(none)>
Date: Sun, 18 Jul 2010 12:28:14 -0600
Subject: [PATCH] Fix /[\8]/ to not match NULL; give correct warning

8 and 9 are not treated as alphas in parsing as opposed to illegal
octals.

This also adds tests to verify that 1-3 digits work in char classes.

I created an isOCTAL macro in case that lookup gets moved to a bit
field, as I plan to do later, for speed.

---
Flags:
    category=core
    severity=high
    category=parsing
    category=regex
---
Site configuration information for perl 5.13.5:

Configured by sprout at Sun Sep 19 17:34:01 PDT 2010.

Summary of my perl5 (revision 5 version 13 subversion 5 patch v5.13.5-8-g8e58c70) configuration:
  Snapshot of: 8e58c70c18b867212fb426b17ffd66a1bb1e1064
  Platform:
    osname=darwin, osvers=10.4.0, archname=darwin-thread-multi-2level
    uname='darwin pint.local 10.4.0 darwin kernel version 10.4.0: fri apr 23 18:28:53 pdt 2010; root:xnu-1504.7.4~1release_i386 i386 '
    config_args='-de -Dusedevel -DDEBUGGING -Duseithreads'
    hint=recommended, useposix=true, d_sigaction=define
    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='cc', ccflags ='-fno-common -DPERL_DARWIN -no-cpp-precomp -DDEBUGGING -fno-strict-aliasing -pipe -fstack-protector -I/usr/local/include',
    optimize='-O3 -g',
    cppflags='-no-cpp-precomp -fno-common -DPERL_DARWIN -no-cpp-precomp -DDEBUGGING -fno-strict-aliasing -pipe -fstack-protector -I/usr/local/include'
    ccversion='', gccversion='4.2.1 (Apple Inc. build 5664)', gccosandvers=''
    intsize=4, longsize=4, ptrsize=4, doublesize=8, byteorder=1234
    d_longlong=define, longlongsize=8, d_longdbl=define, longdblsize=16
    ivtype='long', ivsize=4, nvtype='double', nvsize=8, Off_t='off_t', lseeksize=8
    alignbytes=8, prototype=define
  Linker and Libraries:
    ld='env MACOSX_DEPLOYMENT_TARGET=10.3 cc', ldflags =' -fstack-protector -L/usr/local/lib'
    libpth=/usr/local/lib /usr/lib
    libs=-ldbm -ldl -lm -lutil -lc
    perllibs=-ldl -lm -lutil -lc
    libc=/usr/lib/libc.dylib, so=dylib, useshrplib=false, libperl=libperl.a
    gnulibc_version=''
  Dynamic Linking:
    dlsrc=dl_dlopen.xs, dlext=bundle, d_dlsymun=undef, ccdlflags=' '
    cccdlflags=' ', lddlflags=' -bundle -undefined dynamic_lookup -L/usr/local/lib -fstack-protector'

Locally applied patches:
    

---
@INC for perl 5.13.5:
    /usr/local/lib/perl5/site_perl/5.13.5/darwin-thread-multi-2level
    /usr/local/lib/perl5/site_perl/5.13.5
    /usr/local/lib/perl5/5.13.5/darwin-thread-multi-2level
    /usr/local/lib/perl5/5.13.5
    /usr/local/lib/perl5/site_perl
    .

---
Environment for perl 5.13.5:
    DYLD_LIBRARY_PATH (unset)
    HOME=/Users/sprout
    LANG=en_US.UTF-8
    LANGUAGE (unset)
    LD_LIBRARY_PATH (unset)
    LOGDIR (unset)
    PATH=/usr/bin:/bin:/usr/sbin:/sbin:/usr/local/bin:/usr/X11/bin:/usr/local/bin
    PERL_BADLANG (unset)
    SHELL=/bin/bash

• [perl #78058] qr/\88/ hangs (Bleadperl breaks JE again) by Father Chrysostomos
• PATCH Re: [perl #78058] qr/\88/ hangs (Bleadperl breaks JE again) by karl williamson
• [perl #78058] qr/\88/ hangs (Bleadperl breaks JE again) by Father Chrysostomos via RT