Damn you. I was going to post that. :-P

Yeah, I wouldn't have used the s/// if I'd remembered rindex. You'll have to forgive me, I was tired last night (yay 12 hours of overtime...).

Anyway, here's my version of the substr/rindex version. It uses the same algorithm as my regexp version (ie, it's still destructive to $str) and is a little cleaner than yours (but not much):

# MAKE SURE $str IS A _COPY_ OF YOUR DATA!!!
my $str = "/One/Two/Three";

my @paths = ();

while($str) {
    # If you don't want @push to include the current
    # cat (ie, "/One/Two/Three"), put this line after
    # the substr.  But then you'll have as the last
    # element an empty string.  Put a "last unless($str);"
    # between the substr and the push to avoid that.
    push @paths, $str;

    # Save everything from the begining of the string
    # up to, but not including, the last /.
    $str = substr($str, 0, rindex($str, '/'));
}

print "$_\n" for @paths;
[download]

This prints:

/One/Two/Three
/One/Two
/One
[download]

bbfu
Seasons don't fear The Reaper.
Nor do the wind, the sun, and the rain.
We can be like they are.