How to replace whole word with Word Boundaries in Java?

How to replace a word in a sentence in java

If you want to replace the whole word with the word boundaries in a string. For this, we use "\b" regular expression token which is called a word boundary. It usually matches at the start or the end of a word.

Example: You just need to place the word between word boundaries

package com.legendblogs.test;

public class TestApps {
      *@param args
    public static void main(String[] args){
        String s = "A man is an Ironman like manpower";

        //It will replace if the first character is a word character or not
        String d = s.replaceAll("\\bman", "tony");

        //It will replace if  if the last character is a word character or not
        String b = s.replaceAll("man\\b", "tony");

        //It will replace whole word only
        String c = s.replaceAll("\\bman\\b", "tony");



A tony is an Ironman like tonypower

A tony is an Irontony like manpower

A tony is an Ironman like manpower

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