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[perl #114192] .*? interferes with ...(*SKIP)(*FAIL)
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From:
Jim Avera
Date:
July 18, 2012 13:28
Subject:
[perl #114192] .*? interferes with ...(*SKIP)(*FAIL)
Message ID:
rt-3.6.HEAD-11172-1342643266-666.114192-75-0@perl.org
# New Ticket Created by Jim Avera
# Please include the string: [perl #114192]
# in the subject line of all future correspondence about this issue.
# <URL: https://rt.perl.org:443/rt3/Ticket/Display.html?id=114192 >
This is a bug report for perl from james_avera@yahoo.com,
generated with the help of perlbug 1.39 running under perl 5.14.2.
-----------------------------------------------------------------
I'm not sure this is a bug, but it seems awfully suspicious:
Given a regex T which matches the input,
if T involves (*SKIP)(*FAIL) then
.*T matches
.*?T does not match
What is it about the non-greedy prefix which interferes with T matching?
#!/usr/bin/perl
use strict; use warnings;
my $pattern=qr/
(?: \@[\w\.]+ (*SKIP)(*FAIL) ) # dont match parts of email domain name
|
(?: \bTHIS\b )
/x;
my $_ = 'prefix foo@bar.that.com before THIS after';
print "pattern = $pattern\n";
print "\$_ = '$_'\n";
for my $code (
'(${pattern})', # matches
'(.*)(${pattern})', # matches
'(.*?)(${pattern})', # does NOT match
) {
my $pat = eval "\"$code\"";
printf "%-23s ", $code;
if (/$pat/) {
print " \$1=$1" if defined $1;
print " \$2=$2" if defined $2;
print " \$3=$3" if defined $3;
print "\n";
} else {
die $@ if $@;
print " Match failed.\n";
}
}
-----------------------------------------------------------------
---
Flags:
category=core
severity=low
---
Site configuration information for perl 5.14.2:
Configured by Debian Project at Fri Mar 23 17:14:02 UTC 2012.
Summary of my perl5 (revision 5 version 14 subversion 2) configuration:
Platform:
osname=linux, osvers=2.6.24-31-server, archname=x86_64-linux-gnu-thread-multi
uname='linux allspice 2.6.24-31-server #1 smp tue feb 14 13:12:22 utc 2012 x86_64 x86_64 x86_64 gnulinux '
config_args='-Dusethreads -Duselargefiles -Dccflags=-DDEBIAN -Dcccdlflags=-fPIC -Darchname=x86_64-linux-gnu -Dprefix=/usr -Dprivlib=/usr/share/perl/5.14 -Darchlib=/usr/lib/perl/5.14 -Dvendorprefix=/usr -Dvendorlib=/usr/share/perl5 -Dvendorarch=/usr/lib/perl5 -Dsiteprefix=/usr/local -Dsitelib=/usr/local/share/perl/5.14.2 -Dsitearch=/usr/local/lib/perl/5.14.2 -Dman1dir=/usr/share/man/man1 -Dman3dir=/usr/share/man/man3 -Dsiteman1dir=/usr/local/man/man1 -Dsiteman3dir=/usr/local/man/man3 -Duse64bitint -Dman1ext=1 -Dman3ext=3perl -Dpager=/usr/bin/sensible-pager -Uafs -Ud_csh -Ud_ualarm -Uusesfio -Uusenm -Ui_libutil -DDEBUGGING=-g -Doptimize=-O2 -Duseshrplib -Dlibperl=libperl.so.5.14.2 -des'
hint=recommended, useposix=true, d_sigaction=define
useithreads=define, usemultiplicity=define
useperlio=define, d_sfio=undef, uselargefiles=define, usesocks=undef
use64bitint=define, use64bitall=define, uselongdouble=undef
usemymalloc=n, bincompat5005=undef
Compiler:
cc='cc', ccflags ='-D_REENTRANT -D_GNU_SOURCE -DDEBIAN -fno-strict-aliasing -pipe -fstack-protector -I/usr/local/include -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64',
optimize='-O2 -g',
cppflags='-D_REENTRANT -D_GNU_SOURCE -DDEBIAN -fno-strict-aliasing -pipe -fstack-protector -I/usr/local/include'
ccversion='', gccversion='4.6.3', gccosandvers=''
intsize=4, longsize=8, ptrsize=8, doublesize=8, byteorder=12345678
d_longlong=define, longlongsize=8, d_longdbl=define, longdblsize=16
ivtype='long', ivsize=8, nvtype='double', nvsize=8, Off_t='off_t', lseeksize=8
alignbytes=8, prototype=define
Linker and Libraries:
ld='cc', ldflags =' -fstack-protector -L/usr/local/lib'
libpth=/usr/local/lib /lib/x86_64-linux-gnu /lib/../lib /usr/lib/x86_64-linux-gnu /usr/lib/../lib /lib /usr/lib
libs=-lgdbm -lgdbm_compat -ldb -ldl -lm -lpthread -lc -lcrypt
perllibs=-ldl -lm -lpthread -lc -lcrypt
libc=, so=so, useshrplib=true, libperl=libperl.so.5.14.2
gnulibc_version='2.15'
Dynamic Linking:
dlsrc=dl_dlopen.xs, dlext=so, d_dlsymun=undef, ccdlflags='-Wl,-E'
cccdlflags='-fPIC', lddlflags='-shared -O2 -g -L/usr/local/lib -fstack-protector'
Locally applied patches:
---
@INC for perl 5.14.2:
/etc/perl
/usr/local/lib/perl/5.14.2
/usr/local/share/perl/5.14.2
/usr/lib/perl5
/usr/share/perl5
/usr/lib/perl/5.14
/usr/share/perl/5.14
/usr/local/lib/site_perl
.
---
Environment for perl 5.14.2:
HOME=/home/t
LANG=en_US.UTF-8
LANGUAGE=
LD_LIBRARY_PATH (unset)
LOGDIR (unset)
PATH=/usr/lib/lightdm/lightdm:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games
PERL_BADLANG (unset)
SHELL=/bin/bash
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