On this page
numpy.char.chararray.rfind
method
char.chararray.rfind(sub, start=0, end=None)[source]- 
    
For each element in
self, return the highest index in the string where substringsubis found, such thatsubis contained within [start,end].See also
 
© 2005–2021 NumPy Developers
Licensed under the 3-clause BSD License.
 https://numpy.org/doc/1.20/reference/generated/numpy.char.chararray.rfind.html