https://www.w3schools.com/PYTHON/ref_string_rfind.asp
Python String rfind() Method
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python stringmethod
https://timsong-cpp.github.io/cppwp/n4659/string.rfind
[string.rfind]
string
https://www.codecademy.com/resources/docs/cpp/strings/rfind
C++ (C Plus Plus) | Strings | rfind() | Codecademy
Searches a string from right to left and returns the last occurrence of a substring or character.
c plusstringscodecademy