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Re: cut a string in a string

by serf (Chaplain)
on Feb 03, 2006 at 17:57 UTC ( #527751=note: print w/replies, xml ) Need Help??

in reply to cut a string in a string

If you are matching many instances of this (say reading a log file that is 700MB or more and checking each line for this string) then you are likely to find that the performance improves if you:
  • tie the match down to the bare minimum of wildcard characters,
  • specify everything that you know is going to be in the match,
  • and also anchor the match where possible to the beginning and end of the string (or line) so it doesn't have to try iterating over the string...
use strict; use warnings; my $line = "SNMPv2-MI::enterprises.343."; my $match = $1 if $line =~ /^SNMPv2-MI::enterprises([0-9\.]+)=INT$/;

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[Corion]: Interesting indeed!
[Discipulus]: practical use for?
[marto]: finding bugs, either in the CPU layer or hypervisor, finding undocumented instructions

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