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Python | Replace multiple occurrence of character by single

  • Last Updated : 29 Dec, 2020
Geek Week

Given a string and a character, write a Python program to replace multiple occurrences of the given character by a single character.

Examples:

Input : Geeksforgeeks, ch = 'e'
Output : Geksforgeks

Input : Wiiiin, ch = 'i'
Output : Win

 

Approach #1 : Naive Approach
This method is a brute force approach in which we take another list ‘new_str’. Use a for loop to check if the given character is repeated or not. If repeated multiple times, append the character single time to the list. Other characters(Not the given character) are simply appended to the list without any alteration.




# Python program to replace multiple 
# occurrences of a character by a single character
  
def replace(s, ch):
    new_str = []
    l = len(s)
      
    for i in range(len(s)):
        if (s[i] == ch and i != (l-1) and
           i != 0 and s[i + 1] != ch and s[i-1] != ch):
            new_str.append(s[i])
              
        elif s[i] == ch:
            if ((i != (l-1) and s[i + 1] == ch) and
               (i != 0 and s[i-1] != ch)):
                new_str.append(s[i])
                  
        else:
            new_str.append(s[i])
          
    return ("".join(i for i in new_str))
  
  
# Driver code 
s = 'Geeksforgeeks'
char = 'e'
print(replace(s, char))
Output:



Geksforgeks

 
Approach #2 : Using Python Regex




import re
  
# Function to replace multiple occurrences  
# of a character by a single character
def replace(string, char):
    pattern = char + '{2,}'
    string = re.sub(pattern, char, string)
    return string
  
# Driver code 
string = 'Geeksforgeeks'
char = 'e'
print(replace(string, char))
Output:
Geksforgeks

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