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# numpy.core.defchararray.rfind

`numpy.core.defchararray.``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].

  Calls str.rfind element-wise.

  Parameters: | a : array-like of str or unicode sub : str or unicode start, end : int, optional Optional arguments start and end are interpreted as in slice notation.
  Returns: | out : ndarray Output array of ints. Return -1 on failure.

  See also

  `str.rfind`