How to count repeated substring in a given string in Python

In this article, we will learn how to use the inbuilt count function using examples. Then we will see how to count repeated substring in a given string in Python.

Python has a built-in function for counting the repeated substring in a given string called count(). As the name suggests, it counts the occurrence of a substring in a given string.

Python – count() function

string="abcdefghijklmnop"
string.count(substring, start_index, end_index)

The count function has 3 parameters.

1. Substring: This parameter is compulsory since it specifies the string whose occurrence is to be found.
2. Start_index: This parameter is optional. It gives the starting index of the string from which the search will begin.
3. End_index: This parameter is optional. It gives the ending index of the string where the search for substring will end.

Read: Count number of occurrences of a substring in a string in Python

Count repeated substring in a given string in Python

1. This example only contains the compulsory parameter. In this, we first define a string, then by using the count function calculate the occurrence of substring “aab” in the string defined above.

   string= "aabbcaabcbbcaabdaab"
   print(string.count("aab"))

   Output:

   4

2. This example contains compulsory as well as the optional parameters. In this, we first define a string, then by using the count function calculate the occurrence of substring “aab” in the string starting from index 2 and ending at index 15 instead of considering the whole string.

   string= "aabbcaabcbbcaabdaab"
   print(string.count("aab",2,15))

   Output:

   2