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. 

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

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. 

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

Using find() method

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

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.

String after the first occurrence of substring:  for Lazyroar

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