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Re: Match string in array

by polypompholyx (Chaplain)
on Oct 03, 2005 at 19:09 UTC ( #497024=note: print w/ replies, xml ) Need Help??

in reply to Match string in array

You probably want something like this: use a hash to record all the items in the first array, then grep for items in the second array that you haven't already seen:

my %seen_in_1; $seen_in_1{$_}++ for @rray1; my @in_2_but_not_1 = grep { not $seen_in_1{$_} } @rray2;

Or, to avoid duplicates:

my %seen_in_1; $seen_in_1{$_}++ for @rray1; my $seen_in_2_but_not_1; $seen_in_2_but_not_1{$_}++ for grep { not $seen_in_1{$_} } @rray2; my @in_2_but_not_1 = keys %seen_in_2_but_not_1;

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