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Hello, I'm using the negative lookahead assertion in a regular expression to parse tokens of a text file that start with a '>'. Some of the tokens can be very long like 500, 1000 or up to 2000 lines long. It seems that the negative lookahead assertion fails on tokens that are too many lines long. For example, if you run the following code on Cygwin Perl version 5.8.6, the program crashes at line 1547. I'm running this on a Win2K, 512 MB Ram machine. Also, I've attached the output from cygcheck -s -r. I've posted this to perlmonks.org. Please see the discussion at http://www.perlmonks.org/index.pl?node_id=453725. Grinder asked "I don't suppose that your Cygwin or Mac builds of Perl do something extra, like running in utf-8 by default?" Does anybody know if Cygwin Perl runs utf-8 by default? #!/usr/bin/perl use strict; # initially, create a scalar that is 1 line long my $line = ">"."\n" x 1; my $incr = 1; while (1) { # run until it crashes while ($line =~ /^(>.*)\n(^(?!>).*\n)+/gm) { print "Number of lines: ", length($line)-1,"\n"; } # add another line $line .= "\n" x $incr; } Thank you, Paul Paul Cantalupo Research Specialist/Systems Programmer 559 Crawford Hall Department of Biological Sciences University of Pittsburgh Pittsburgh, PA 15260 Work: 412-624-4687 Fax: 412-624-4759 Ask me about Toastmasters: www.toastmasters.org Midday Club Treasurer
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cygcheck.s.r.out
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