Home » Core Java » util » regex » Matcher replaceAll – Part 2

About Ilias Tsagklis

Ilias is a software developer turned online entrepreneur. He is co-founder and Executive Editor at Java Code Geeks.

Matcher replaceAll – Part 2

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 ReplaceExample {

    public static void main(String args[]) {


  String regex = "(\w)(\d)(\w+)";

  Pattern pattern = Pattern.compile(regex);


  String candidate = "X99SuperJava";

  Matcher matcher = pattern.matcher(candidate);

  String tmp = matcher.replaceAll("$33");


  System.out.println("REPLACEMENT: " + tmp);

  System.out.println("ORIGINAL: " + candidate);

  
    }
}

Output:

REPLACEMENT: 9SuperJava3
ORIGINAL: X99SuperJava

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

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