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Re: Hash problem

by rupesh (Hermit)
on May 19, 2005 at 04:29 UTC ( #458516=note: print w/ replies, xml ) Need Help??


in reply to Hash problem


use strict; my %hash; foreach(<DATA>) { $hash{$1}=() if /JSESSIONID=(.*)$/; } foreach (sort keys %hash) { print $_."\n"; } __DATA__ [17/May/2005:18:15:59 -0700]sdjhsj USERID=t70xvcy; jdhdh JSESSIONID=00 +00RDnYTABcRWOx0UN2Zq--sZB:10f408hdg [17/May/2005:18:15:59 -0700]sdjhsj USERID=t70xvcy; jdhdh JSESSIONID=00 +00RDnYTABcRWOx0UN2Zq--sZB:10f408hdg [17/May/2005:18:15:59 -0700]sdjhsj USERID=t70xvcy; jdhdh JSESSIONID=00 +00RDnYTABcRWOx0UN2Zq--sZB:10f408g13


Cheers,
Rupesh.


Comment on Re: Hash problem
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Re^2: Hash problem
by bart (Canon) on May 19, 2005 at 09:24 UTC
    I am amazed that
    $hash{$1}=()
    works without warning, on 5.6.1 and on 5.8.4, as does
    my $x = ();

    Can anybody explain, are my expectations so off?

      From perldata:

      If you evaluate an array in scalar context, it returns the length
      of the array. (Note that this is not true of lists, which return the last
      value, like the C comma operator, nor of built-in functions, which
      return whatever they feel like returning.)

      An empty list doesn't have any values, so trying to get the last value gives you undef.


      We're not surrounded, we're in a target-rich environment!

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