- char.rfind(a, sub, start=0, end=None)¶
For each element in a, return the highest index in the string where substring sub is found, such that sub is contained within [start, end].
- aarray-like of str or unicode
- substr or unicode
- start, endint, optional
Optional arguments start and end are interpreted as in slice notation.
Output array of ints. Return -1 on failure.