$new = param('home'); Now I wanna check to see if new has a / at the end

if ($new !~ m[/$]) {
[download]

if it doesnt then add a /.

    $new .= '/';
}
[download]

But it's a url so what if the user uses a \ instead of /.

URLs use slashes, not backslashes.

By the way: $new =~ s[\z(?<!/)][/];.

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