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numpy.char.chararray.rfind
method
- chararray.rfind(self, sub, start=0, end=None)
- 
    For each element in self, return the highest index in the string where substringsubis found, such thatsubis contained within [start,end].See also char.rfind
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 https://numpy.org/doc/1.19/reference/generated/numpy.char.chararray.rfind.html