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Um, no. Not sure, sure, but that is what I believe to be the case following various discussions regarding the use of qr// and the contrast between it, using /o on a specific m// or s///, and the utility (or otherwise) of using the /o operator in conjuction with qr//o.
What I think (though) that the concensus was that using /o on the qr// operator was a waste of time as qr// effectively already did once-only compilation.
It's quite possible I have misinterreted this (again), and given that it's you that challenging my assumptions, and your likely to reply with a Devel::* dump demostrating that this is not the case, I'll turn the statement into a question and ask....Is this slightly dangerous?
Examine what is said, not who speaks.
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I threw some debug-foo at this code fragment and came up with yes and no. Looking at the code via B::Concise it looks like the regex is compiled each time. Looking at the code view use re 'debug' it looks like it's compiled only once. I suppose that enough digging through perl's guts would provide a real answer but really -- I'd rather just use qr to control when the regex is compiled and not have to worry about what the internals are doing.
I mean, there are times it's interesting and useful to know what's happening but this case is just too opaque to get at.
my @in = qw(nc01123.log
nc02123.log
nc03123.log);
my $year = '0';
my $month = '2';
@in = grep { /^nc$year$month.*\.log$/ } @in;
print "@in\n";
__END__
Try zero: The nested sub block was hard to read so this didn't yield t
+oo much.
perl -MO=Concise test.pl
Try one: This makes it look like the regex is compiled anew each time.
perl -MO=Concise,-exec test.pl
Try two: This looks like the regex is compiled only once. Or maybe deb
+ug just <i>dumps</i> it once.
use re 'debug';
Fun Fun Fun in the Fluffy Chair | [reply]
[d/l]
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I am not really going for optimisation (yet)... just want a script that will parse my log files that will search for attempted DOS's and stuff and then take those IP's and add them to our deny list. That is all I am writing this for.
-----------------------
Billy S.
Slinar Hardtail - Hand of Dane
Datal Ephialtes - Guildless
RallosZek.Net Admin/WebMaster
perl -e '$cat = "cat"; if ($cat =~ /\143\x61\x74/) { print "Its a cat!
+\n"; } else { print "Thats a dog\n"; } print "\n";'
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[d/l] |