The reason you're getting the zero-length elements is that you have two delimiters that follow eachother. Inbetween those delimiters there's nothing, and therefore you get a string holding nothing.
Example:
$_ = 'XABX';
print "<$_>" for split /A|B/;
__END__
<X>
<>
<X>
Step by step, it goes a little like this:
'X' . 'A' . 'BX' # 'A' matched.
'BX' # 'A' removed, 'X' returned.
'' . 'B' . 'X' # 'B' matched.
'X' # 'B' removed, '' returned.
ihb
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