Program to replace a word with asterisks in a sentence

15 Jul, 2022
For the given sentence as input, censor a specific word with asterisks ‘ * ‘. Example : 
Input : word = “computer” text = “GeeksforGeeks is a computer science portal for geeks. People who love computer and computer codes can contribute their valuables/ideas on computer codes/structures on here.” Output : GeeksforGeeks is a ******** science portal for geeks. People who love ******** and ******** codes can contribute their valuables/ideas on ******** codes/structures on here.
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The idea is to first split given sentence into different words. Then traverse the word list. For every word in the word list, check if it matches with given word. If yes, then replace the word with stars in the list. Finally merge the words of list and print.  
C++
Java
Python3
C#
PHP
Javascript
// C++ program to censor a word// with asterisks in a sentence#include<bits/stdc++.h>#include <boost/algorithm/string.hpp>using namespace std; // Function takes two parameterstring censor(string text,                    string word){     // Break down sentence by ' ' spaces    // and store each individual word in    // a different list    vector<string> word_list;    boost::split(word_list, text, boost::is_any_of("\\ +"));     // A new string to store the result    string result = "";     // Creating the censor which is an asterisks    // "*" text of the length of censor word    string stars = "";    for (int i = 0; i < word.size(); i++)        stars += '*';     // Iterating through our list    // of extracted words    int index = 0;    for (string i : word_list)    {                 if (i.compare(word) == 0)        {             // changing the censored word to            // created asterisks censor            word_list[index] = stars;        }        index++;    }     // join the words    for (string i : word_list)    {        result += i + ' ';    }    return result;} // Driver codeint main(){    string extract = "GeeksforGeeks is a computer science "                    "portal for geeks. I am pursuing my "                    "major in computer science. ";    string cen = "computer";    cout << (censor(extract, cen));} // This code is contributed by Rajput-Ji
// Java program to censor a word// with asterisks in a sentenceclass GFG{ // Function takes two parameterstatic String censor(String text,                     String word){     // Break down sentence by ' ' spaces    // and store each individual word in    // a different list    String[] word_list = text.split("\\s+");     // A new string to store the result    String result = "";     // Creating the censor which is an asterisks    // "*" text of the length of censor word    String stars = "";    for (int i = 0; i < word.length(); i++)        stars += '*';     // Iterating through our list    // of extracted words    int index = 0;    for (String i : word_list)    {        if (i.compareTo(word) == 0)             // changing the censored word to            // created asterisks censor            word_list[index] = stars;        index++;    }     // join the words    for (String i : word_list)        result += i + ' ';     return result;} // Driver codepublic static void main(String[] args){    String extract = "GeeksforGeeks is a computer science "+                     "portal for geeks. I am pursuing my " +                     "major in computer science. ";    String cen = "computer";    System.out.println(censor(extract, cen));}} // This code is contributed by// sanjeev2552
# Python Program to censor a word# with asterisks in a sentence  # Function takes two parameterdef censor(text, word):     # Break down sentence by ' ' spaces    # and store each individual word in    # a different list    word_list = text.split()     # A new string to store the result    result = ''     # Creating the censor which is an asterisks    # "*" text of the length of censor word    stars = '*' * len(word)     # count variable to    # access our word_list    count = 0     # Iterating through our list    # of extracted words    index = 0;    for i in word_list:         if i == word:                         # changing the censored word to            # created asterisks censor            word_list[index] = stars        index += 1     # join the words    result =' '.join(word_list)     return result # Driver codeif __name__== '__main__':         extract = "GeeksforGeeks is a computer science portal for geeks.\               I am pursuing my major in computer science. "                  cen = "computer"       print(censor(extract, cen))
// C# program to censor a word// with asterisks in a sentenceusing System;using System.Collections.Generic;     class GFG{ // Function takes two parameterstatic String censor(String text,                     String word){     // Break down sentence by ' ' spaces    // and store each individual word in    // a different list    String[] word_list = text.Split(' ');     // A new string to store the result    String result = "";     // Creating the censor which is an asterisks    // "*" text of the length of censor word    String stars = "";    for (int i = 0; i < word.Length; i++)        stars += '*';     // Iterating through our list    // of extracted words    int index = 0;    foreach (String i in word_list)    {        if (i.CompareTo(word) == 0)             // changing the censored word to            // created asterisks censor            word_list[index] = stars;        index++;    }     // join the words    foreach (String i in word_list)        result += i + " ";     return result;} // Driver codepublic static void Main(String[] args){    String extract = "GeeksforGeeks is a computer science "+                     "portal for geeks. I am pursuing my " +                     "major in computer science. ";    String cen = "computer";    Console.WriteLine(censor(extract, cen));}} // This code is contributed by PrinciRaj1992
<?php// PHP Program to censor a word// with asterisks in a sentence // Function takes two parameterfunction censor($text, $word){     // Break down sentence by ' ' spaces    // and store each individual word in    // a different list    $word_list = explode(" ", $text);     // A new string to store the result    $result = '';     // Creating the censor which is an    // asterisks "*" text of the length    // of censor word    $stars = "";    for($i = 0; $i < strlen($word); $i++)    $stars .= "*";     // count variable to access    // our word_list    $count = 0;     // Iterating through our list of    // extracted words    $index = 0;    for($i = 0; $i < sizeof($word_list); $i++)    {        if($word_list[$i] == $word)                         // changing the censored word to            // created asterisks censor            $word_list[$index] = $stars;        $index += 1;    }         // join the words    return implode(' ', $word_list);} // Driver code$extract = "GeeksforGeeks is a computer science ".           "portal for geeks.\nI am pursuing my ".                    "major in computer science. ";        $cen = "computer";echo censor($extract, $cen); // This code is contributed// by Aman ojha?>
<script>       // JavaScript program to censor a word      // with asterisks in a sentence             // Function takes two parameter      function censor(text, word) {        // Break down sentence by ' ' spaces        // and store each individual word in        // a different list        var word_list = text.split(" ");         // A new string to store the result        var result = "";         // Creating the censor which is an asterisks        // "*" text of the length of censor word        var stars = "";        for (var i = 0; i < word.length; i++) stars += "*";         // Iterating through our list        // of extracted words        var index = 0;        for (const i of word_list) {          if (i === word)            // changing the censored word to            // created asterisks censor            word_list[index] = stars;          index++;        }         // join the words        for (const i of word_list) {          result += i + " ";        }         return result;      }       // Driver code      var extract =        "GeeksforGeeks is a computer science " +        "portal for geeks. I am pursuing my " +        "major in computer science. ";               var cen = "computer";      document.write(censor(extract, cen) + "<br>");       </script>
GeeksforGeeks is a ******** science portal for geeks. I am pursuing my major in ******** science.  
Time complexity: O(length(word)+M), where M is the number of words in text
Auxiliary Space: O(1)
Approach : Using replace() in python3.Replace() method searches for the string passed as the first argument in the given string and then replaces that with the second argument.
Python3
# Python Program to censor a word# with asterisks in a sentence extract = "GeeksforGeeks is a computer science portal for geeks.I am pursuing my major in computer science. "           cen = "computer"extract=extract.replace(cen,'*'*len(cen))print(extract)
GeeksforGeeks is a ******** science portal for geeks.\I am pursuing my major in ******** science. 
Aman ojha
sanjeev2552
princiraj1992
Rajput-Ji
rdtank
hasani
kogantibhavya
Python string-programs
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