[Python] How to split pandas Series into two based on whether or not the index contains a...

I have pandas series that I want to split into two: one with all the entries of the original series where index contains a certain word and the other with all the remaining entries.

Getting a series of entries which do contain a certain word in their index is easy:

foo_series = original_series.filter(like = "foo")


But how do I get the rest?

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