# numpy.char.index

char.index(a, sub, start=0, end=None)

  Like `find`, but raises ValueError when the substring is not found.

  Calls `str.index` element-wise.

  Parameters
    a array_like of str or unicode
    sub str or unicode
    start, end int, optional
  Returns
    out ndarray

      Output array of ints. Returns -1 if sub is not found.

  See also

  `find`, `str.find`

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