I'm probably pounding a thumbtack with a sledgehammer, here, but what about something like (and this assumes that $Start and $Finish don't change through the code operation): 
my $machine = {$Start => \&do_this,
               $Finish => \&do_that};

my $doit = \&do_this;
foreach my $line(@Input)
{
    my $func = $machine->{$line};
    $doit = $func if (defined $func);

    $doit();
}

[download]
Now, this is totally untested but something like this should work...
--
Wade

In reply to Re: Iteration condition... by wade
in thread Iteration condition... by abachus

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