Python | Get the string after occurrence of given substring

Sometimes, more than finding a substring, we might need to get the string that is occurring after the substring has been found. Let’s discuss certain ways in which this task can be performed using Python.

Using partition() to get string after occurrence of given substring

The partition function can be used to perform this task in which we just return the part of partition occurring after the partition word. 

Python3

# initializing string
test_string = "GeeksforGeeks is best for geeks"

# initializing split word
spl_word = 'best'

# printing original string
print("The original string : " + str(test_string))

# printing split string
print("The split string : " + str(spl_word))

# using split()
# Get String after substring occurrence
res = test_string.split(spl_word, 1)
splitString = res[1]

# print result
print("String after the substring occurrence : " + splitString)

Output

The original string : GeeksforGeeks is best for geeks
The split string : best
String after the substring occurrence :  for geeks

Using split() to get string after occurrence of given substring

The split function can also be applied to perform this particular task, in this function, we use the power of limiting the split and then print the later string. 

Python3

# initializing string
test_string = "GeeksforGeeks is best for geeks"

# initializing split word
spl_word = 'best'

# printing original string
print("The original string : " + str(test_string))

# printing split string
print("The split string : " + str(spl_word))

# using split()
# Get String after substring occurrence
res = test_string.split(spl_word, 1)

# print result
print("String after the substring occurrence : " + res[1])

Output : 

The original string : GeeksforGeeks is best for geeks
The split string : best
String after the substring occurrence :  for geeks

Using find() method

Python3

# Python3 code to demonstrate
# Get String after substring occurrence

# initializing string
test_string = "GeeksforGeeks is best for geeks"

# initializing split word
spl_word = 'best'

# printing original string
print("The original string : " + str(test_string))

# printing split string
print("The split string : " + str(spl_word))

res=test_string[test_string.find(spl_word)+len(spl_word):]

# print result
print("String after the substring occurrence : " + res)

Output

The original string : GeeksforGeeks is best for geeks
The split string : best
String after the substring occurrence :  for geeks

Time Complexity: O(n)
Auxiliary Space: O(n), where n is length of string.

Using re to get string after occurrence of given substring:

This approach uses a regular expression to search for the first occurrence of the substring in the input string, and returns the portion of the string after the substring if it is found. If the substring is not found, an empty string is returned.

Python3

import re

test_string = "GeeksforGeeks is best for geeks"
spl_word = 'best'

# Get String after first occurrence of substring
match = re.search(spl_word, test_string)
if match:
    res = test_string[match.end():]
else:
    res = ''

print("String after the first occurrence of substring:", res)
#This code is contributed by Edula Vinay Kumar Reddy

Output

String after the first occurrence of substring:  for geeks

Time complexity: O(n), where n is the length of the input string.
Auxiliary space: O(1), as no additional data structures are used.