Python | Find last occurrence of substring

Sometimes, while working with strings, we need to find if a substring exists in the string. This problem is quite common and its solution has been discussed many times before. The variation of getting the last occurrence of the string is discussed here. Let’s discuss certain ways in which this can be performed.

Method #1 : Using rindex()

This method returns the last occurrence of the substring if present in the string. The drawback of this function is that it throws the exception if there is no substring in the string and hence breaks the code.



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# Python3 code to demonstrate
# Find last occurrence of substring
# using rindex()
  
# initializing string 
test_string = "GfG is best for CS and also best for Learning"
  
# initializing target word 
tar_word = "best"
  
# printing original string 
print("The original string : " + str(test_string))
  
# using rindex()
# Find last occurrence of substring
res = test_string.rindex(tar_word)
  
# print result
print("Index of last occurrence of substring is : " + str(res))

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Output :

The original string : GfG is best for CS and also best for Learning
Index of last occurrence of substring is : 28

 

Method #2 : Using rfind()

This is the alternate method to perform this task. The advantage that this function offers better than the above method is that, this function returns a “-1” if a substring is not found rather than throwing the error.

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# Python3 code to demonstrate
# Find last occurrence of substring
# using rfind()
  
# initializing string 
test_string = "GfG is best for CS and also best for Learning"
  
# initializing target word 
tar_word = "best"
  
# printing original string 
print("The original string : " + str(test_string))
  
# using rfind()
# Find last occurrence of substring
res = test_string.rfind(tar_word)
  
# print result
print("Index of last occurrence of substring is : " + str(res))

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Output :

The original string : GfG is best for CS and also best for Learning
Index of last occurrence of substring is : 28


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