Matcher group example – Part 2

This is an example of how to use group) API method to get the input subsequence captured by the given group during the previous match operation. Grouping with a Matcher implies that you should:

  • 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 group(int group) API method to get subsequence captured by the group during the previous match, or null if the group failed to match part of the input.

Let’s take a look at the code snippet that follows:

package com.javacodegeeks.snippets.core;

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

public class MatcherGroup {
  public static void main(String args[]) {
    String regex = "(\w+)(\d\d)(\w+)";

    Pattern pattern = Pattern.compile(regex);

    String candidate = "X99SuperJava";

    Matcher matcher = pattern.matcher(candidate);





This was an example of group) 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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