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The rfind() string method determines the index of the last occurrence of a particular string value within the invoked string object.

• Signature of rfind() method




# Signature of rfind() method
 rfind(value)




Parameters	Description
value	This is a string value, which is searched in the invoked string and the method rfind() returns the last index of value(if found), otherwise -1 is returned.








• Example of rfind() method


We are searching for the last index of a particular value in a string object using rfind() method. If the searched value is found in multiple indexes, its last index is returned.



# Python - Program to find a particular string value in a string.



# Creating a string
s1 = 'Do not give up!'


# Finding the index of a value 'not' in the string
index1 = s1.rfind('not')

print('last index of not in ',  s1 , ' : ' , index1)



# Finding the index of a value 'giv' in the string
index2 = s1.rfind('giv')

print('last index of giv in ', s1 ,  ' : ', index2)



# Finding the index of a value 'o' in the string
index3 = s1.rfind('o')

print('last index of o in ', s1 ,  ' : ', index3)





Output is :




last index of not in  Do not give up!  :  3
last index of giv in  Do not give up!  :  7
last index of o in  Do not give up!  :  4





Program Analysis



String is initialized with value Do not give up!
• Index of the last occurrence of value not in the string object is found 3.
• Index of the last occurrence of value giv in the string object is found 7.
• Index of the last occurrence of value o in the string object is found, hence 4 is returned.







• If the searched value is not found, the -1 is returned


Here in this next example, we are searching for the index of a particular value in a string object using rfind() method. If the searched string is found, its last index is returned, otherwise the -1 is returned.



# Python - Program to find a particular string value in a string.



# Creating a string
s1 = 'Hasta la vista!'


# Finding the index of a value 'haha' in the string
index1 = s1.rfind('pasta')

print('last index of pasta in ', s1 ,  ' : ', index1)





Output is :




last index of pasta in  Hasta la vista!  :  -1






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• Method rfind() performs a case-sensitive search.

The rfind() method perform a case-sensitive search, when it comes to search an index of a specific value in a string object.

# Python - Program to find a particular value in a String.


s1 = 'Rock and roll!'
s2 = 'Live a happy life!'

index1 = s1.rfind('ro')
index2 = s2.rfind('li')

print('last index of ro in ', s1, ' : ', index1)
print('last index of li in ', s1, ' : ', index2)

Output is :

last index of ro in  Rock and roll!  :  9
last index of li in  Rock and roll!  :  13

Program Analysis

First String is initialized with value Rock and roll!, second String is initialized with value Live a happy life!.
• Index of the last occurrence of value lower case ro in the first String object is found at index 9.
• Index of the last occurrence of value lower case li in the second String object is found at index 13.

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