To keep this problem from happening again, you might want to look at Quantum::Superpositions, specifically the any() and all() functions.
Eh, no, you don't. Quantum::Superpositions is extremely slow. There's no justification for using Quantum::Superpositions, just to save typing a pair of parenthesis. Here's a benchmark: 
#!/usr/bin/perl

use strict;  
use warnings;

use Benchmark qw /cmpthese/;
use Quantum::Superpositions;

our @data1  = "aa" .. "zz";
our @data2  = "AA" .. "ZZ";

my %queries = (
    middle  =>  [$data1 [@data1 / 2], $data2 [@data2 / 2]],
    first   =>  [$data1 [0],          $data2 [0]],
    not     =>  ["feeble",            "fnord"],
);

foreach my $type (qw /middle first not/) {
    warn "Running '$type' test.\n";
    
    our ($q1, $q2) = @{$queries {$type}};
    our ($a_g, $a_q);
    
    cmpthese -1 => {
        grep    => '$a_g = grep ({$q1 eq $_} @data1) &&
                           grep ({$q2 eq $_} @data2)',
        QS      => '$a_q = $q1 eq any (@data1) && $q2 eq any (@data2)'
+,
    };
    
    die "Unequal" if $a_g xor $a_q;
    print "\n";
}

__END__
Running 'middle' test.
       Rate    QS  grep
QS   24.5/s    --  -99%
grep 2376/s 9588%    --

Running 'first' test.
       Rate    QS  grep
QS   24.1/s    --  -99%
grep 2400/s 9869%    --

Running 'not' test.
       Rate     QS   grep
QS   48.6/s     --   -99%
grep 5744/s 11719%     --

[download]

Abigail

In reply to Re: multiple greps at once-- possible? by Abigail-II
in thread multiple greps at once-- possible? by sulfericacid

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