Re: fast string parser: regex versus substr


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Re: fast string parser: regex versus substr

by mce (Curate)

on Nov 20, 2003 at 16:55 UTC ( #308622=note: print w/ replies, xml )

Need Help??

in reply to fast string parser: regex versus substr

Thanks all,

I came up with.

sub dopack {
   foreach my $i ( 0..$#data ) {
      my $line=$data[$i];
      my ($jcpu,$j,$s)=(unpack('@2A16A40A232A16', $line))[0,1,3];
      warn "$jcpu $j $s";
      # ..store the values in a hash, but that is not important here
      }
   }
[download]

And it won the benchmark competition :-)

I never really understood pack and unpack, but it am getting to like it.
---------------------------
Dr. Mark Ceulemans
Senior Consultant
BMC, Belgium

Comment on Re: fast string parser: regex versus substr Download Code
Re: Re: fast string parser: regex versus substr by bart (Canon) on Nov 20, 2003 at 22:24 UTC
`my ($jcpu,$j,$s)=(unpack('@2A16A40A232A16', $line))[0,1,3];` [download] I think you'd be better off using the "x" template to ignore the third field (with index 2): `my ($jcpu,$j,$s)= unpack('@2A16A40x232A16', $line);` [download] You can replace the leading '@2' with 'x2'', too. Or, just the reverse, replace the 'x232' with '@290'. I don't think it'll make much difference speedwise.	[reply] [d/l] [select]

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