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strange regexp substitute problem #658

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p5pRT opened this issue Sep 30, 1999 · 2 comments
Closed

strange regexp substitute problem #658

p5pRT opened this issue Sep 30, 1999 · 2 comments

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@p5pRT
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@p5pRT p5pRT commented Sep 30, 1999

Migrated from rt.perl.org#1538 (status was 'resolved')

Searchable as RT1538$

@p5pRT
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@p5pRT p5pRT commented Sep 30, 1999

From root@inter.nl.net

I found a very strange problem. The string ".-@​" in a regexp differs
from the string "-.@​". Here's a sample of problematic code​:

------
#!/usr/local/bin/perl -w
use strict;

my $a="Does this substitution work? !@​#$^&*() 123...---@​@​@​///";

$a=~s/[^.-@​]//g; # erratic
print "[$a]\n";

$a=~s/[^-.@​]//g; # ok
print "[$a]\n";
------

The output​:

------
[root@​cabernet]# perl /tmp/test
[?@​123...@​@​@​///]
[@​...@​@​@​]
------

I hope this is not some syntax problem I overlooked.

Perl Info


Site configuration information for perl 5.00503:

Configured by mauricem at Tue Apr  6 14:34:11 MET DST 1999.

Summary of my perl5 (5.0 patchlevel 5 subversion 3) configuration:
  Platform:
    osname=solaris, osvers=2.5.1, archname=sun4-solaris
    uname='sunos lent 5.5.1 generic_103640-18 sun4u sparc sunw,ultra-1 '
    hint=recommended, useposix=true, d_sigaction=define
    usethreads=undef useperlio=undef d_sfio=undef
  Compiler:
    cc='gcc -B/usr/ccs/bin/', optimize='-O', gccversion=2.7.2.2
    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=n, prototype=define
  Linker and Libraries:
    ld='gcc -B/usr/ccs/bin/', ldflags =' -L/usr/local/lib'
    libpth=/usr/local/lib /lib /usr/lib /usr/ccs/lib
    libs=-lsocket -lnsl -ldb -ldl -lm -lc -lcrypt
    libc=/lib/libc.so, 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:
    /usr/local/gnu/lib/perl5/5.00503/sun4-solaris
    /usr/local/gnu/lib/perl5/5.00503
    /usr/local/gnu/lib/perl5/site_perl/5.005/sun4-solaris
    /usr/local/gnu/lib/perl5/site_perl/5.005
    .


Environment for perl 5.00503:
    HOME=/
    LANG (unset)
    LANGUAGE (unset)
    LD_LIBRARY_PATH (unset)
    LOGDIR (unset)
    PATH=/usr/local/bin:/usr/local/sbin:/usr/local/etc:/usr/local/X11/bin:/usr/local/gnu/bin:/vol/tex/bin:/opt/SUNWspro/bin:/usr/ccs/bin:/usr/bin:/usr/sbin:/usr/ucb
    PERL_BADLANG (unset)
    SHELL=/sbin/sh

@p5pRT
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@p5pRT p5pRT commented Sep 30, 1999

From [Unknown Contact. See original ticket]

Altrade Super-User <root@​inter.nl.net> wrote

I found a very strange problem. The string ".-@​" in a regexp differs
from the string "-.@​".

As documented. From perlre​:

  Within a list,
  the "-" character is used to specify a range, so that a-z
  represents all characters between "a" and "z", inclusive.
  If you want "-" itself to be a member of a class, put it at
  the start or end of the list, or escape it with a backslash.

Mike Guy

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