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NumPy | rfind method

NumPy
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Char
schedule Jul 1, 2022
Last updated
local_offer PythonNumPy
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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. startlink | int | optional

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

4. endlink | 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"))    # 0
print(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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Published by Isshin Inada
Edited by 0 others
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