regex

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");


  System.out.println(str2);

    }
}

Output:

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

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

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.
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