I don't understand what you're trying to do. Where does that Darksaber stuff come from, anyway? The second line looks like it could be from the title metadata field, and from what I can see, the groups' second lines (the stuff after the Darksaber) are as one would expect, but I don't understand where the Darksaber in the group results is coming from. What metadata field is that string contained in?
Also, looking at your expression, the last group
isn't doing anything. The syntax is for a non-grouping parentheses, but it's empty. In your second group, using the square brackets is unnecessary. You should use something like
for any number or, if the series index always has two digits and only two digits, use
or