import java.util.regex.*;
public class JavaRegExp {
public static void main(String[] args) {
String input = "abdcxyz";
myMatches("([a-z])([a-z]+)", input);
myMatches("([a-z]+)([a-z]*)", input);
myMatches("([a-z]+)([a-z]+)", input);
}
public static void myMatches(String regex, String input) {
Pattern pattern = Pattern.compile(regex);
Matcher matcher = pattern.matcher(input);
if(matcher.matches()) {
System.out.println("Null group: " + matcher.group(0));
System.out.println("First group: " + matcher.group(1));
System.out.println("Second group: " + matcher.group(2));
} else
System.out.println("nothing");
System.out.println();
}
}