In the event that anyone uses the same system that I do for naming books (or something similar) here is the RegEx code I use for importing:
(?P<author>[^_-]+) - (\((?P<series>[^-]+) - Book (?P<series_index>\d\d?)\) )?(?P<title>[^-]+)
My file names are like:
Last, First - (Series Name - Book 01) Title of the book.txt