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crdf,
Yes, it is possible there is no series info for a particular book.
But one thing to be very careful of with that regex is that all the fields are separated by the exact pattern of " - " (space dash space). If other characters are used in the filename, the data will not be imported incorrectly. Or, if the filenames follow a different field pattern (like: Title - Author - Series Series_Index) then data will not be imported correctly.
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