Just with map:
use strict;
use warnings;
use Data::Dumper;
my $orig = { 'foo' => 2, 'bar' => 4, 'boo' => 1, 'zar' => 5 };
my $dest;
map { /oo/ and $dest->{$_} = $orig->{$_} } keys %$orig;
print Dumper $dest;
__END__
Output:
$VAR1 = {
'boo' => 1,
'foo' => 2
};
hth, PooLpi
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