Hi,
The above RegEx failed on Windows because under Windows the directory delimiter is backslash \. The RegEx was written for Linux where the directory delimiter is forward slash /. For Windows, the RegEx would be:

$0 =~ /(.*\\)*(.+)/;
print $2;
[download]

The following RegEx would work for both Windows and Linux:

$0 =~ /(.*(\\|\/))*(.+)/;
print $3;
[download]