Python replace only first occurrence

If we want to replace only the first occurrences of a substring in a string with another character or sub-string, then we need to pass the count argument as 1 in the replace() function,,Unlike the previous example, if we want to replace only the first two occurrences of a substring in a string, then we need to pass the count argument as 2 in the replace() function,,To replace all the occurrences of a substring in a string in Python, we will pass the sub-string and replacement string as arguments to the replace() function i.e.,replace() function returned a copy of the original string but with modified content. It replaced only the first two occurrences of ‘is’ sub-string with ‘ZZZ’ in the copied string.

Syntax of the replace() function

str.replace(old, new [, count])

To replace all the occurrences of a substring in a string in Python, we will pass the sub-string and replacement string as arguments to the replace() function i.e.

sample_str = "This is a sample string, where is need to be replaced."

sample_str = sample_str.replace('is', 'ZZZ')
print(sample_str)

Output:

ThZZZ ZZZ a sample string, where ZZZ need to be replaced.

Suggestion : 2

Given a String, the task is to write a Python program to replace occurrences by K of character at 1st index, except at 1st index.,In this, we perform task of replacing entire string from 2nd character with K of the character occurring at 1st index. The result is prefix joined by first character.,Python | Split string into list of characters,Python program to convert a list to string

Examples:

Input: test_str = 'geeksforgeeksforgeeks', K = '@'
Output: geeksfor @eeksfor @eeks

Explanation: All occurrences of g are converted to @ except 0 th index.

Input: test_str = 'geeksforgeeks', K = '#'
Output: geeksfor #eeks

Explanation: All occurrences of g are converted to # except 0 th index.

Output:

The original string is: geeksforgeeksforgeeks
Replaced String: geeksfor$eeksfor$eeks

Suggestion : 3

Use Python built-in replace() function to replace the first character in the string. The str.replace takes 3 parameters old, new, and count (optional).,How to change character in string Python. Use the list() and join the funciton.,Simple example code using replace() function to returns a copy of the string with all occurrences of substring old replaced by new.,Where count indicates the number of times you want to replace the old substring with the new substring.

Where count indicates the number of times you want to replace the old substring with the new substring.

str.replace(old, new [, count])

Simple example code using replace() function to returns a copy of the string with all occurrences of substring old replaced by new.

s = "Hello World!"

res = s.replace("H", "X", 1)

print(res)

If you don’t want to use str.replace(), you can manually do it by taking advantage of splicing

s = "Hello World!"

def rep(s, char, index):
   return s[: index] + char + s[index + 1: ]

# Test
res = rep(s, "Z", 0)
print(res)

Suggestion : 4

Python offers easy and simple functions for string handling. The easiest way to replace all occurrences of a given substring in a string is to use the replace() function.,Now, what if we don't wish to change all occurrences of a substring? What if we want to replace the first n?,Replace n Occurrences of a Substring,In this article, we'll be using the replace() function as well as the sub() and subn() functions with patterns to replace all occurrences of a substring from a string.

Let's say, we have a string that contains the following sentence:

The brown - eyed man drives a brown car.

Our goal is to replace the word "brown" with the word "blue":

The blue - eyed man drives a blue car.

The simplest way to do this is by using the built-in function - replace() :

string.replace(oldStr, newStr, count)

Suggestion : 5

text.replace("text", "new", count)
# count is the number of instances you want to replace

Suggestion : 6

The replace() method replaces a specified phrase with another specified phrase.,Note: All occurrences of the specified phrase will be replaced, if nothing else is specified.,Replace all occurrence of the word "one":,Replace the two first occurrence of the word "one":

Definition and Usage

The replace() method replaces a specified phrase with another specified phrase.