Re: testing number of occurrences in a word

[borisz]

I do not know what a isogram is. But maybe this is what you search.

$_ = <>;
my %h;
$h{$_}++ for ( split // );
my $not_isog = () = grep $_ > 1, values %h;
print "$_ is ", $not_isog ? 'not ' : '', "isog\n";