[Israel.pm] segmentation fault in regex

Sun Mar 12 05:13:29 PST 2006

I would suggest removing the comments in two stages:
s#//(.*)\n##sg;  # removes single line comments (//...)
s#/\*(.*)\*/##sg # removes multiple line comments (/*...*/)

Best Regards,
Dov Levenglick
DSP SoC System and Applications Engineer,
Network and Computing Systems Group
Freescale Semiconductor Israel
Tel. +972-9-952-2804
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-----Original Message-----
From: perl-bounces at perl.org.il [mailto:perl-bounces at perl.org.il] On Behalf Of Yossi.Itzkovich at ecitele.com
Sent: Sunday, March 12, 2006 2:53 PM
To: Perl in Israel
Subject: Re: [Israel.pm] segmentation fault in regex

Hi,
Thanks Eli && Shlomi for your responses.

The complex regex was originally taken from perldoc FAQ how to remove C/C++
comments. May be I modified it a little (it was 2 years ago, so I don't
remember).

I am ready to simplify it, as long as it does what it has (no more , no
less)

             Eli Billauer                                                  
             <eli at billauer.co.                                             
             il>                                                        To 
             Sent by:                  Perl in Israel <perl at perl.org.il>   
             perl-bounces at perl                                          cc 
             .org.il                                                       
                                                                   Subject 
                                       Re: [Israel.pm] segmentation fault  
             12/03/2006 14:49          in regex                            

             Please respond to                                             
              Perl in Israel                                               
             <perl at perl.org.il                                             
                     >                                                     

This is what my Perl v5.6.1 had to say:

--------------------
$ perl regex_segfault.pl  test_file.txt
test_file.txt
Complex regular subexpression recursion limit (32766) exceeded at
regex_segfault.pl line 7, <FILE> chunk 1.
--------------------

Your Perl probably wasn't as polite. Maybe you want to downgrade? ;)

My hunch is that you've used an excessively complicated regex to do
something (I'm not in the mood for deciphering that expression).

Maybe tell us what you want to do, and we'll play "who's got the
prettiest regex" on it? ;)

    Eli

Yossi.Itzkovich at ecitele.com wrote:

>OK, let's try.
>
>The file is at ftp://ftp.ecitele.com/outgoing/inf_vie.htm
>
>
>
>The code:
>#! /usr/local/bin/perl -w
>my $name=shift;
>open (FILE,$name) or die "BLA\n";
>local $/;
>my $file=<FILE>;
>print "$name\n";
>$file=~
>s~/\*[^*]*\*+([^/*][^*]*\*+)*/|//[^\n]*|(\"(\\.|[^\"\\])*\"|'(\\.|[^'\\])*'|.[^/"'\\]*)~$2~gs;

>
>Any ideas ?
>
>Yossi
>
>
>
>

--
Web: http://www.billauer.co.il

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