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NumPy | rfind method

schedule Aug 11, 2023
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Numpy's `rfind(~)` method returns the starting index of the last occurrence of the specified substring in each input string. If not found, -1 is returned.

NOTE

Difference between `rfind(~)` and `find(~)`

The difference between methods `rfind(~)` and `find(~)` is that `rfind(~)` returns the index of the last occurrence of the substring, while `find(~)` returns the index of the first occurrence. See the example below for clarification.

Parameters

1. `a` | `array_like`

The source array.

2. `sub` | `string`

The substring to search for in the source array.

3. `start`link | `int` | `optional`

The index to start searching from. By default, `start=0`.

4. `end`link | `int` | `optional`

The index to search until. By default, end is equal to the size of the input array.

Return value

A Numpy array of integer indices.

Examples

Basic usage

``` np.char.rfind(["aabcd", "def"], "bc") array([ 2, -1]) ```

Notice how `-1` is returned for `"def"` since it does not include the substring `"bc"`.

Comparison with find method

``` print(np.char.find("abab", "ab"))    # 0print(np.char.rfind("abab", "ab"))   # 2 ```

Specifying a starting index

``` np.char.rfind(["abcd"], "ab", start=1) array([-1]) ```

Since we are starting from the 1st index, the search is performed on the string `"bcd"`, which does not contain the substring `"ab"`.

Specifying an ending index

``` np.char.rfind(["abcd"], "cd", end=3) array([-1]) ```

Since we stop our search at the 3rd index (inclusive), the search is performed on the string `"abc"`, which does not contain the substring `"cd"`.

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