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import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class Main {
public static void main(String[] argv) throws Exception {
Pattern p = Pattern.compile("t(est)");
String candidateString = "This is a test. This is a test.";
Matcher matcher = p.matcher(candidateString);
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);
}
}
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