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About Byron Kiourtzoglou

Byron is a master software engineer working in the IT and Telecom domains. He is an applications developer in a wide variety of applications/services. He is currently acting as the team leader and technical architect for a proprietary service creation and integration platform for both the IT and Telecom industries in addition to a in-house big data real-time analytics solution. He is always fascinated by SOA, middleware services and mobile development. Byron is co-founder and Executive Editor at Java Code Geeks.

Matcher replaceAll example

In this example we shall show you how to use Matcher.replaceAll(String replacement) API method to replace every subsequence of an input sequence that matches a specified pattern with a given replacement string. To replace any subsequence of a given sequence with a given String one should perform the following steps:

  • Compile a String regular expression to a Pattern, using compile(String regex) API method of Pattern.
  • Use matcher(CharSequence input) API method of Pattern to create a Matcher that will match the given String input against this pattern.
  • Use replaceAll(String replacement) API method, with a given String parameter to replace all subsequences of the sequence that matches the pattern with the given String,

as described in the code snippet below.

package com.javacodegeeks.snippets.core;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class MatcherReplaceAll {

    public static void main(String args[]) {


  Pattern pattern = Pattern.compile("(i|I)ce");

  //create the candidate String

  String str = "I love ice. Ice is my favorite. Ice Ice Ice.";

  Matcher m = pattern.matcher(str);

  String str2 = m.replaceAll("Java");




I love Java. Java is my favorite. Java Java Java.

This was an example of Matcher.replaceAll(String replacement) API method in Java.

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