Use splitpath from File::Spec and split:
use strict;
use warnings;
use File::Spec;
while (<DATA>)
{
chomp;
my @subs = split /\\/, (File::Spec->splitpath ($_)) [1];
print "sub dir is: $subs[2]\n" if $#subs > 1;
print "No sub dir in $_\n" if $#subs <= 1;
}
__DATA__
C:\dir1\
C:\dir1\subdir1\
C:\dir1\subdir1\subdir2\
Prints:
No sub dir in C:\dir1\
sub dir is: subdir1
sub dir is: subdir1
DWIM is Perl's answer to Gödel
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