# --- Part one ---
@single = qw(I sit here and think-
             what the-hell am
             i doing with perl?);

foreach (@single)
{
    s/[,.?-]//g;  # Updated: strip punctuation
    print "$_\n";
}


# --- Part two ---
$a= "I sit here and think-
     what the-hell am
     i doing with perl?";

$a=~ s/[,.?-]//g;
print "$_\n" for $a =~ /(\w+)/g;
[download]

And the output -

I
sit
here
and
think
what
thehell
am
i
doing
with
perl
[download]