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

• Compile a String regular expression to aPattern, usingcompile(String regex) API method of Pattern.
• Usematcher(CharSequence input) API method of Pattern to create aMatcher that will match the given String input against this pattern.
• Usefind() API method of Matcher to get the matches of the input with the pattern.
• Usegroup(int group) API method to get the input subsequence captured by the given group during the previous match operation.

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 MatcherGroupExample {    public static void main(String args[]) {  Pattern pattern = Pattern.compile("B(ond)");  String str = "My name is Bond. James Bond.";  Matcher m = pattern.matcher(str);  m.find();  String group_0 = m.group(0);  String group_1 = m.group(1);  System.out.println("Group 0 " + group_0);  System.out.println("Group 1 " + group_1);  System.out.println(str);  m.find();  group_0 = m.group(0);  group_1 = m.group(1);  System.out.println("Group 0 " + group_0);  System.out.println("Group 1 " + group_1);  System.out.println(str);    }}

Output:

Group 0 BondGroup 1 ondMy name is Bond. James Bond.Group 0 BondGroup 1 ondMy name is Bond. James Bond.

 
This was an example of how to useMatcher.group(int group) API method in Java.

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