regex

Matcher group example

This is an example of how to use Matcher.group(int 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 find() API method of Matcher to get the matches of the input with the pattern.
  • Use group(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 Bond
Group 1 ond
My name is Bond. James Bond.
Group 0 Bond
Group 1 ond
My name is Bond. James Bond.

 
This was an example of how to use Matcher.group(int 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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