Python - Extract String after Nth occurrence of K character

Python – Extract String after Nth occurrence of K character

Last Updated : 14 Oct, 2020

Given a String, extract the string after Nth occurrence of a character.

Input : test_str = ‘geekforgeeks’, K = “e”, N = 2
Output : kforgeeks
Explanation : After 2nd occur. of “e” string is extracted.

Input : test_str = ‘geekforgeeks’, K = “e”, N = 4
Output : ks
Explanation : After 4th occur. of “e” string is extracted.

Method #1 : Using split()

This is one of the ways in which this task can be performed. In this we customize split() to split on Nth occurrence and then print the rear extracted string using “-1”.

Python3

# Python3 code to demonstrate working of  
# Extract String after Nth occurrence of K character  
# Using split() 
  
# initializing string 
test_str = 'geekforgeeks'
  
# printing original string 
print("The original string is : " + str(test_str)) 
  
# initializing K  
K = "e"
  
# initializing N  
N = 3
  
# using split() to perform required string split 
# "-1" to extract required part 
res = test_str.split(K, N)[-1] 
  
# printing result  
print("The extracted string : " + str(res))  

Output

The original string is : geekforgeeks
The extracted string : eks

Method #2 : Using re.split()

This is yet another way to solve this problem. Similar to above function, we perform split() to perform task of splitting but from regex library which also provides flexibility to split on Nth occurrence.

Python3

# Python3 code to demonstrate working of  
# Extract String after Nth occurrence of K character  
# Using re.split() 
import re 
  
# initializing string 
test_str = 'geekforgeeks'
  
# printing original string 
print("The original string is : " + str(test_str)) 
  
# initializing K  
K = "e"
  
# initializing N  
N = 3
  
# using split() to perform required string split 
# "-1" to extract required part 
res = re.split(K, test_str, N)[-1] 
  
# printing result  
print("The extracted string : " + str(res))  

Output

The original string is : geekforgeeks
The extracted string : eks

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