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regex fails on a literal following n times quantifier #930

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p5pRT opened this issue Dec 9, 1999 · 3 comments
Closed

regex fails on a literal following n times quantifier #930

p5pRT opened this issue Dec 9, 1999 · 3 comments
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distro-Solaris type-library

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@p5pRT
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p5pRT commented Dec 9, 1999

Migrated from rt.perl.org#1873 (status was 'resolved')

Searchable as RT1873$
@p5pRT
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p5pRT commented Dec 9, 1999

From boigy@casc.com

Created by boigy@lucent.com

The following code fragment incorrectly fails regular expression match
(it does match successfully in 5.00401)​:

  $_="16 00 00 00 06 00 00 00 00 00 00 00 00 00 1F 00 ";
  /^(([A-F0-9u][A-F0-9u] ){4} ){4} *$/;

For comparison, the following fragment does appear to work
(replaces a literal space with a '.' metacharacter)​:

  $_="16 00 00 00 06 00 00 00 00 00 00 00 00 00 1F 00 ";
  /^(([A-F0-9u][A-F0-9u] ){4}.){4} *$/;

Perl Info 


Site configuration information for perl 5.00503:

Configured by boigy at Mon Oct 25 16:44:26 EDT 1999.

Summary of my perl5 (5.0 patchlevel 5 subversion 3) configuration:
  Platform:
    osname=solaris, osvers=2.5.1, archname=sun4-solaris
    uname='sunos distinct 5.5.1 generic_103640-24 sun4u sparc sunw,ultra-5_10 '
    hint=previous, useposix=true, d_sigaction=define
    usethreads=undef useperlio=undef d_sfio=undef
  Compiler:
    cc='gcc', optimize='-O', gccversion=2.6.3
    cppflags='-I/usr/local/include'
    ccflags ='-I/usr/local/include'
    stdchar='unsigned char', d_stdstdio=define, usevfork=false
    intsize=4, longsize=4, ptrsize=4, doublesize=8
    d_longlong=define, longlongsize=8, d_longdbl=define, longdblsize=16
    alignbytes=8, usemymalloc=y, prototype=define
  Linker and Libraries:
    ld='gcc', ldflags =' -L/usr/local/lib'
    libpth=/usr/local/lib /lib /usr/lib /usr/ccs/lib
    libs=-lsocket -lnsl -ldl -lm -lc -lcrypt
    libc=, so=so, useshrplib=false, libperl=libperl.a
  Dynamic Linking:
    dlsrc=dl_dlopen.xs, dlext=so, d_dlsymun=undef, ccdlflags=' '
    cccdlflags='-fPIC', lddlflags='-G -L/usr/local/lib'

Locally applied patches:
    


@INC for perl 5.00503:
    /software/switch/tools/lib/perl5/5.00503/sun4-solaris
    /software/switch/tools/lib/perl5/5.00503
    /software/switch/tools/lib/perl5/site_perl/5.005/sun4-solaris
    /software/switch/tools/lib/perl5/site_perl/5.005
    .


Environment for perl 5.00503:
    HOME=/home/boigy
    LANG=C
    LANGUAGE (unset)
    LD_LIBRARY_PATH=/usr/lib:/opt/software/tools/amc/master/lib:/usr/dt/lib::/usr/dt/lib:/usr/openwin/lib:/opt/IXImd12s/lib:/opt/SUNWmotif/lib:/usr/4lib:/opt/NeWSprint/lib:/opt/software/X11R6/lib:/opt/software/X11R5/lib:/opt/software/clarify/lib:/home/boigy/lib:/home/boigy/lib/rvplayer5.0:/software/switch/tools/mri960/master/lib
    LOGDIR (unset)
    PATH=/usr/atria/bin:/usr/atria/local:/home/boigy/bin:/usr/bin:/usr/openwin/bin:/usr/sbin:/usr/ucb:/bin:/opt/SUNWmotif/bin:/etc:/opt/software/X11R6/bin:/opt/software/tools/bin:/usr/ccs/bin:/home/boigy/bin/hosts:/software/switch/tools/bin:/software/switch/tools/mri960/bin:/opt/software/tools/amc/master/mwbin:/software/switch/tools/crash/bin:/software/switch/tools/bin:/software/switch/tools/mri960/bin:/opt/software/tools/amc/master/bin:/opt/software/tools/amc/master/mwbin:/opt/software/tools/snav40/bin
    PERL_BADLANG (unset)
    SHELL=/bin/tcsh


Site configuration information for perl 5.00503:

Configured by boigy at Mon Oct 25 16:44:26 EDT 1999.

Summary of my perl5 (5.0 patchlevel 5 subversion 3) configuration:
  Platform:
    osname=solaris, osvers=2.5.1, archname=sun4-solaris
    uname='sunos distinct 5.5.1 generic_103640-24 sun4u sparc sunw,ultra-5_10 '
    hint=previous, useposix=true, d_sigaction=define
    usethreads=undef useperlio=undef d_sfio=undef
  Compiler:
    cc='gcc', optimize='-O', gccversion=2.6.3
    cppflags='-I/usr/local/include'
    ccflags ='-I/usr/local/include'
    stdchar='unsigned char', d_stdstdio=define, usevfork=false
    intsize=4, longsize=4, ptrsize=4, doublesize=8
    d_longlong=define, longlongsize=8, d_longdbl=define, longdblsize=16
    alignbytes=8, usemymalloc=y, prototype=define
  Linker and Libraries:
    ld='gcc', ldflags =' -L/usr/local/lib'
    libpth=/usr/local/lib /lib /usr/lib /usr/ccs/lib
    libs=-lsocket -lnsl -ldl -lm -lc -lcrypt
    libc=, so=so, useshrplib=false, libperl=libperl.a
  Dynamic Linking:
    dlsrc=dl_dlopen.xs, dlext=so, d_dlsymun=undef, ccdlflags=' '
    cccdlflags='-fPIC', lddlflags='-G -L/usr/local/lib'

Locally applied patches:
    


@INC for perl 5.00503:
    /software/switch/tools/lib/perl5/5.00503/sun4-solaris
    /software/switch/tools/lib/perl5/5.00503
    /software/switch/tools/lib/perl5/site_perl/5.005/sun4-solaris
    /software/switch/tools/lib/perl5/site_perl/5.005
    .


Environment for perl 5.00503:
    HOME=/home/boigy
    LANG=C
    LANGUAGE (unset)
    LD_LIBRARY_PATH=/usr/lib:/opt/software/tools/amc/master/lib:/usr/dt/lib::/usr/dt/lib:/usr/openwin/lib:/opt/IXImd12s/lib:/opt/SUNWmotif/lib:/usr/4lib:/opt/NeWSprint/lib:/opt/software/X11R6/lib:/opt/software/X11R5/lib:/opt/software/clarify/lib:/home/boigy/lib:/home/boigy/lib/rvplayer5.0:/software/switch/tools/mri960/master/lib
    LOGDIR (unset)
    PATH=/usr/atria/bin:/usr/atria/local:/home/boigy/bin:/usr/bin:/usr/openwin/bin:/usr/sbin:/usr/ucb:/bin:/opt/SUNWmotif/bin:/etc:/opt/software/X11R6/bin:/opt/software/tools/bin:/usr/ccs/bin:/home/boigy/bin/hosts:/software/switch/tools/bin:/software/switch/tools/mri960/bin:/opt/software/tools/amc/master/mwbin:/software/switch/tools/crash/bin:/software/switch/tools/bin:/software/switch/tools/mri960/bin:/opt/software/tools/amc/master/bin:/opt/software/tools/amc/master/mwbin:/opt/software/tools/snav40/bin
    PERL_BADLANG (unset)
    SHELL=/bin/tcsh

@p5pRT
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p5pRT commented Dec 9, 1999

From [Unknown Contact. See original ticket]

Thomas Seidenberg writes​:

The following code fragment incorrectly fails regular expression match
(it does match successfully in 5.00401)​:

$_="16 00 00 00 06 00 00 00 00 00 00 00 00 00 1F 00 ";
/^(([A-F0-9u][A-F0-9u] ){4} ){4} *$/;

Thanks, This is an already reported bug in REx sniffer​:
-Mre=debugcolor reports​:

anchored ` ' at 2 floating `'$ at 52..2147483647 (checking anchored noscan) anchored(BOL) minlen 52

As you can see, it thinks that the substring ' ' should appear at
offset 2 (instead of 11). Moreover, it misses a better substring
' ' at offset 46.

This bug appears with non-variable {n} only.

Ilya

@p5pRT
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p5pRT commented Jul 17, 2000

From @vanstyn

Way back, Thomas Seidenberg (boigy@​lucent.com) wrote​:
:The following code fragment incorrectly fails regular expression match
:(it does match successfully in 5.00401)​:
:
: $_="16 00 00 00 06 00 00 00 00 00 00 00 00 00 1F 00 ";
: /^(([A-F0-9u][A-F0-9u] ){4} ){4} *$/;

I note that this is fixed by the recent patch to perl-5.6.0​:
  http​://www.xray.mpe.mpg.de/mailing-lists/perl5-porters/2000-07/msg00491.html

Hugo

@p5pRT p5pRT closed this as completed Nov 28, 2003
@p5pRT p5pRT mentioned this issue Oct 19, 2019
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