Question

import java.util.*;
public class ReplaceString {
    public static void main(String[] args) {
        new ReplaceString().run();
    }

    public void run()
    {

        System.out.println("Input String:\n");
        Scanner keyboardScanner = new Scanner(System.in);
        String inString = keyboardScanner.nextLine();
        String strOutput = inString.replace("is","was");
        System.out.println(strOutput);      

    }
}

I am trying to replace all occurences of “is” with “was” from an inputted line, which I was able to do but I do not want to mess the words where “is” is a part of the word.

For example any occurence of word nameis or this should be ignored. Only individual occurences of “is” should be replace with “was”

I know I can use regular expressions but i dont know the format if that regex

Answer 1

Try

 String strOutput = inString.replaceAll("\\bis\\b","was");

reference link

Test output:

Input String:

is island is feris kiss

output

was island was feris kiss