import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class Main {
public static void main(String args[]) {
Pattern p = Pattern.compile("t(est)");
String candidateString = "This is a test. This is another test.";
Matcher matcher = p.matcher(candidateString);
// Find group number 0 of the first find
matcher.find();
String group_0 = matcher.group(0);
String group_1 = matcher.group(1);
System.out.println("Group 0 " + group_0);
System.out.println("Group 1 " + group_1);
System.out.println(candidateString);
}
}