The Wayback Machine - https://web.archive.org/web/20240828062712/https://www.geeksforgeeks.org/replace-in-python-to-replace-a-substring/

replace() in Python to replace a substring

Last Updated : 23 Nov, 2020

Recommended Problem

Replace a word

Companies:

Show Topics

Topics:

Strings Data Structures

Solve Problem

Easy

58.89%

5.7K

Given a string str that may contain one more occurrences of “AB”. Replace all occurrences of “AB” with “C” in str.

Examples:

Input  : str = "helloABworld"
Output : str = "helloCworld"

Input  : str = "fghABsdfABysu"
Output : str = "fghCsdfCysu"

This problem has existing solution please refer Replace all occurrences of string AB with C without using extra space link. We solve this problem in python quickly using replace() method of string data type.

How does replace() function works ?
str.replace(pattern,replaceWith,maxCount) takes minimum two parameters and replaces all occurrences of pattern with specified sub-string replaceWith. Third parameter maxCount is optional, if we do not pass this parameter then replace function will do it for all occurrences of pattern otherwise it will replace only maxCount times occurrences of pattern.

# Function to replace all occurrences of AB with C 
  
def replaceABwithC(input, pattern, replaceWith): 
    return input.replace(pattern, replaceWith) 
  
# Driver program 
if __name__ == "__main__": 
    input   = 'helloABworld'
    pattern = 'AB'
    replaceWith = 'C'
    print (replaceABwithC(input,pattern,replaceWith)) 

Output:

'helloCworld'

S

Shashank Mishra

News

Improve

How to replace a substring of a string

Similar Reads

Python - Replace all occurrences of a substring in a string

Sometimes, while working with Python strings, we can have a problem in which we need to replace all occurrences of a substring with other. Input : test_str = "geeksforgeeks" s1 = "geeks" s2 = "abcd" Output : test_str = "abcdforabcd" Explanation : We replace all occurrences of s1 with s2 in test_str. Input : test_str = "geeksforgeeks" s1 = "for" s2

Partition given string in such manner that i'th substring is sum of (i-1)'th and (i-2)'th substring

Partition given string in such manner that i'th substring is sum of (i-1)'th and (i-2)'nd substring. Examples: Input : "11235813" Output : ["1", "1", "2", "3", "5", "8", "13"] Input : "1111223" Output : ["1", "11", "12", "23"] Input : "1111213" Output : ["11", "1", "12", "13"] Input : "11121114" Output : []Iterate through the given string by pickin

Length of the largest substring which have character with frequency greater than or equal to half of the substring

Given a string S consisting of characters from 'a' to 'z'. The task is to find the length of the largest substring of S which contains a character whose frequency in the sub-string is greater than or equal to half of the length of the substring.Note: For odd-length substring, to calculate half-length consider integer division. For example, half of

Minimum length of substring whose rotation generates a palindromic substring

Given a string str, the task is to find the minimum length of substring required to rotate that generates a palindromic substring from the given string. Examples: Input: str = "abcbd" Output: 0 Explanation: No palindromic substring can be generated. There is no repeated character in the string. Input: str = "abcdeba" Output: 3 Explanation: Rotate s

Check if substring S1 appear after any occurrence of substring S2 in given sentence

Given strings S1, S2 and S, the task is to check if every substring of S which is same as S1 has another substring of S same as S2 before it. It is given that S1 is always present as a substring in the string S. Examples: Input: S1 = "code", S2 = "geek", S = "sxygeeksgcodetecode"Output: TrueExplanation: Substring S2 is present before both the occur

Check if a string can be split into two substrings such that one substring is a substring of the other

Given a string S of length N, the task is to check if a string can be split into two substrings, say A and B such that B is a substring of A. If not possible, print No. Otherwise, print Yes. Examples : Input: S = "abcdab"Output: YesExplanation: Considering the two splits to be A="abcd" and B="ab", B is a substring of A. Input: S = "abcd"Output: No

Count occurrences of substring X before every occurrence of substring Y in a given string

Given three strings S, X, and Y consisting of N, A, and B characters respectively, the task is to find the number of occurrences of the substring X before every occurrence of the substring Y in the given string S. Examples: Input S = ”abcdefdefabc”, X = ”def”, Y = ”abc”Output: 0 2Explanation:First occurrence of Y(= "abc"): No of occurrences of X(=

Minimize replacement of bits to make the count of 01 substring equal to 10 substring

Given a binary string str. The task is to minimize the number of replacements of '0' by '1' or '1' by '0' to balance the binary string. A binary string is said to be balanced: "if the number of "01" substring = number of "10" substring". Examples: Input: str = "101010" Output: 1Explanation: "01" = 2 & "10" = 3. So change the last character to '

Longest substring whose any non-empty substring not prefix or suffix of given String

Given a string S of length N, the task is to find the length of the longest substring X of the string S such that: No non-empty substring of X is a prefix of S.No non-empty substring of X is a suffix of S.If no such string is possible, print −1. Examples: Input: S = "abcdefb"Output: 4Explanation: cdef is the substring satisfying the conditions. Inp

Longest Substring of A that can be changed to Substring of B in at most T cost

Given two strings A and B of the same length and two positive integers K and T. The task is to find the longest substring of A that can be converted to the same substring at the same position in B in less than or equal to T cost. Converting any character of A to any other character costs K units. Note: If multiple valid substrings are possible then

Minimum removals to make a string concatenation of a substring of 0s followed by a substring of 1s

Given binary string str of length N, the task is to find the minimum number of characters required to be deleted from the given binary string to make a substring of 0s followed by a substring of 1s. Examples: Input: str = "00101101"Output: 2Explanation: Removing str[2] and str[6] or removing str[3] and str[6] modifies the given binary string to

Find if a given string can be represented from a substring by iterating the substring “n” times

Given a string 'str', check if it can be constructed by taking a substring of it and appending multiple copies of the substring together. Examples: Input: str = "abcabcabc" Output: true The given string is 3 times repetition of "abc" Input: str = "abadabad" Output: true The given string is 2 times repetition of "abad" Input: str = "aabaabaabaab" Ou

Python | Pandas Series.str.replace() to replace text in a series

Python is a great language for data analysis, primarily because of the fantastic ecosystem of data-centric Python packages. Pandas is one of those packages that makes importing and analyzing data much easier. Pandas Series.str.replace() method works like Python .replace() method only, but it works on Series too. Before calling .replace() on a Panda

How to replace a substring of a string

Given three strings S, S1, and S2 consisting of N, M, and K characters respectively, the task is to modify the string S by replacing all the substrings S1 with the string S2 in the string S. Examples: Input: S = "abababa", S1 = "aba", S2 = "a"Output: abaExplanation:Change the substrings S[0, 2] and S[4, 6](= S1) to the string S2(= "a") modifies the

SequenceMatcher in Python for Longest Common Substring

Given two strings ‘X’ and ‘Y’, print the longest common sub-string. Examples: Input : X = "GeeksforGeeks", Y = "GeeksQuiz" Output : Geeks Input : X = "zxabcdezy", Y = "yzabcdezx" Output : abcdez We have existing solution for this problem please refer Print the longest common substring link. We will solve problem in python using SequenceMatcher.find

Python | Filter String with substring at specific position

Sometimes, while working with Python string lists, we can have a problem in which we need to extract only those lists that have a specific substring at a specific position. This kind of problem can come in data processing and web development domains. Let us discuss certain ways in which this task can be performed. Method #1: Using list comprehensio

Get the substring of the column in Pandas-Python

Now, we'll see how we can get the substring for all the values of a column in a Pandas dataframe. This extraction can be very useful when working with data. For example, we have the first name and last name of different people in a column and we need to extract the first 3 letters of their name to create their username. Example 1: We can loop throu

How to check if a string starts with a substring using regex in Python?

Prerequisite: Regular Expression in Python Given a string str, the task is to check if a string starts with a given substring or not using regular expression in Python. Examples: Input: String: "geeks for geeks makes learning fun" Substring: "geeks" Output: True Input: String: "geeks for geeks makes learning fun" Substring: "makes" Output: FalseChe

Python - Filter the List of String whose index in second List contains the given Substring

Given two lists, extract all elements from the first list, whose corresponding index in the second list contains the required substring. Examples: Input : test_list1 = ["Gfg", "is", "not", "best", "and", "not", "CS"], test_list2 = ["Its ok", "all ok", "wrong", "looks ok", "ok", "wrong", "thats ok"], sub_str = "ok" Output : ['Gfg', 'is', 'best', 'an

Python SQLAlchemy - Write a query where a column contains a substring

In this article, we discussed how to extract the column values containing substring in SQLAlchemy against a PostgreSQL database in python. In SQLAlchemy, generic functions like SUM, MIN, MAX, are invoked like conventional SQL functions using the func attribute. Some common functions used in SQLAlchemy are contains, count, cube, current_date, curren

Find line number of a specific string or substring or word from a .txt file in Python

Finding the line number of a specific string and its substring is a common operation performed by text editors or any application with some level of text processing capabilities. In this article, you will learn how to find line number of a specific string or substring or word from a .txt (plain text) file using Python. The problem in hand could be

Check if String Contains Substring in Python

This article will cover how to check if a Python string contains another string or a substring in Python. Given two strings, check whether a substring is in the given string. Input: Substring = "geeks" String="geeks for geeks"Output: yesInput: Substring = "geek" String="geeks for geeks"Output: yesExplanation: In this, we are checking if the substri

Python | Check if substring present in string

Let us solve this general problem of finding if a particular piece of string is present in a larger string in different ways. This is a very common kind of problem every programmer comes across atleast once in his/her lifetime. This article gives various techniques to solve it. Method 1: Using in operator The in operator is the most generic, fastes

How to Substring a String in Python

A String is a collection of characters arranged in a particular order. A portion of a string is known as a substring. For instance, suppose we have the string "GeeksForGeeks". In that case, some of its substrings are "Geeks", "For", "eeks", and so on. This article will discuss how to substring a string in Python. Substring a string in PythonUsing S

String Subsequence and Substring in Python

Subsequence and Substring both are parts of the given String with some differences between them. Both of them are made using the characters in the given String only. The difference between them is that the Substring is the contiguous part of the string and the Subsequence is the non-contiguous part of the string . Although Subsequence is a non-cont

Python String Methods | Set 3 (strip, lstrip, rstrip, min, max, maketrans, translate, replace & expandtabs())

Some of the string methods are covered in the below sets.String Methods Part- 1 String Methods Part- 2More methods are discussed in this article1. strip():- This method is used to delete all the leading and trailing characters mentioned in its argument.2. lstrip():- This method is used to delete all the leading characters mentioned in its argument.

MongoDB Python - Insert and Replace Operations

This article focus on how to replace document or entry inside a collection. We can only replace the data already inserted in the database. Prerequisites : MongoDB Python Basics Method used: replace_one() Aim: Replace entire data of old document with a new document Insertion In MongoDB We would first insert data in MongoDB. C/C++ Code # Python code

Map function and Lambda expression in Python to replace characters

Given a string S, c1 and c2. Replace character c1 with c2 and c2 with c1. Examples: Input : str = 'grrksfoegrrks' c1 = e, c2 = r Output : geeksforgeeks Input : str = 'ratul' c1 = t, c2 = h Output : rahul We have an existing solution for this problem in C++. Please refer to Replace a character c1 with c2 and c2 with c1 in a string S. We can solve th

Python | Pandas Series.replace()

Pandas series is a One-dimensional ndarray with axis labels. The labels need not be unique but must be a hashable type. The object supports both integer- and label-based indexing and provides a host of methods for performing operations involving the index. Pandas Series.replace() function is used to replace values given in to_replace with value. Th

Python | Replace negative value with zero in numpy array

Given numpy array, the task is to replace negative value with zero in numpy array. Let’s see a few examples of this problem. Method #1: Naive Method C/C++ Code # Python code to demonstrate # to replace negative value with 0 import numpy as np ini_array1 = np.array([1, 2, -3, 4, -5, -6]) # printing initial arrays print(&quot;initial array&qu

Article Tags :

Practice Tags :