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Python Program to get number of consecutive repeated substring

  • Last Updated : 06 Jun, 2021

Given a substring K, the task is to write a Python Program to find the repetition of K string in each consecutive occurrence of K.

Example

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Input : test_str = ‘geeksgeeks are geeksgeeksgeeks for all geeks’, K = “geeks”



Output : [2, 3, 1]

Explanation : First consecution of ‘geeks’ is 2. 

Input : test_str = ‘geeksgeeks are geeksgeeksgeeksgeeks for all geeks’, K = “geeks”

Output : [2, 4, 1]

Explanation : First consecution of ‘geeks’ is 2, next comes with 4 consecution of geeks.

Method 1: Using split() + count() + list comprehension

Works only for specific cases in which consecution is separated by spaces. In this, each word is splitted using split(), and each segment is evaluated for repetition count using count().

Python3




# Python3 code to demonstrate working of
# Number of repeated substrings in consecution
# Using split() + count() + list comprehension
  
# initializing string
test_str = 'geeksgeeks are geeksgeeksgeeks for all geeks'
  
# printing original string
print("The original string is : " + str(test_str))
  
# initializing K 
K = "geeks"
  
# count() counts repetition
res = [sub.count(K) for sub in test_str.split(' ') if sub.count(K) != 0]
  
# printing result
print("String repetitions : " + str(res))


Output:



The original string is : geeksgeeks are geeksgeeksgeeks for all geeks

String repetitions : [2, 3, 1]

Method 2: Using findall() + regex + len()

In this, all the runs are computed for repetition of substring, and then division of length by substring length gives the measure of repetition number.  

Python3




# Python3 code to demonstrate working of
# Number of repeated substrings in consecution
# Using findall() + regex + len()
import re
  
# initializing string
test_str = 'geeksgeeksaregeeksgeeksgeeksforallgeeks'
  
# printing original string
print("The original string is : " + str(test_str))
  
# initializing K 
K = 'geeks'
n = len(K)
  
# getting regex
regx = re.compile(f'((?:{K})+)')
  
# getting repeats counts
# findall finding all substring joined repetitions
res = [len(occ) // n for occ in regx.findall(test_str)]
  
# printing result
print("String repetitions : " + str(res))


Output:

The original string is : geeksgeeks are geeksgeeksgeeks for all geeks

String repetitions : [2, 3, 1]




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