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# numpy string operations | rfind() function

• Last Updated : 23 Jan, 2019

`numpy.core.defchararray.find(arr, sub, start=0, end=None)` is another function for doing string operations in numpy.It returns the highest index in the string where substring sub is found for each element in arr.It returns -1 if sub is not contained within` [start, end]`.

Parameters:
arr : array_like of str or unicode.
sub : [str or unicode] The substring which to be searched.
start : [ int, optional] The starting location in each string.
end : [ int, optional] The ending location in each string.

Returns : [ndarray] Output array of ints.

Code #1 :

 `# Python program explaining``# numpy.char.rfind() method `` ` `# importing numpy as geek``import` `numpy as geek`` ` `# input arrays  ``in_arr ``=` `geek.array([``'aAaAaA'``, ``'baA'``, ``'abBABba'``])``print` `(``"Input array : "``, in_arr) `` ` `# output arrays ``out_arr ``=` `geek.char.rfind(in_arr, sub ``=``'A'``)``print` `(``"Output array: "``, out_arr) `
Output:

```Input array :  ['aAaAaA' 'baA' 'abBABba']
Output array:  [5 2 3]

```

Code #2 :

 `# Python program explaining``# numpy.char.rfind() method `` ` `# importing numpy as geek``import` `numpy as geek`` ` `# input arrays  ``in_arr ``=` `geek.array([``'aAaAaA'``, ``'aA'``, ``'abBABba'``])``print` `(``"Input array : "``, in_arr) `` ` `# output arrays ``out_arr ``=` `geek.char.rfind(in_arr, sub ``=``'a'``, start ``=` `3``, end ``=` `7``)``print` `(``"Output array: "``, out_arr) `
Output:
```Input array :  ['aAaAaA' 'aA' 'abBABba']
Output array:  [ 4 -1  6]
```

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