Re: How can I assign the elements in an array to only the key values in a hash?

[stefp]

Q: I have an array that keeps returning matches in a string, each match must be inserted into a hash as an empty key (..)

If i judge by your code, you want empty values. Anyway empty keys does not make sense. Because each key of a hash must be unique within the hash set of keys

$hash{$_}=  '' for @array;

usually conunting number of matches for each strings makes more sense:

$hash{$_}++ for @array;

-- stef

[Benedictine Monk]

If you're just trying to remove duplicates from the array (which I'm not sure you are), you can do this:

my @array = getMatches();
my %tmp;
@tmp{@array} = (undef) x @array;
@array = keys %tmp;
undef %tmp;

This takes advantage of Perl's hash slices and can be incredibly useful for set-like operations.

Jerry Goure