import java.util.regex.*;

public class RegEx {
	public static void main(String args[]) {
		// The parenthesis define the groups
		Pattern p = Pattern.compile("([a-z]+)@([0-9]+)");
		Matcher m = p.matcher("mary@123john@456luis@4HOUSE@134");
		while (m.find()) {
			System.out.print("m.group():" + m.group() + "   ");
			System.out.print("m.group(1):" + m.group(1) + "   ");
			System.out.println("m.group(2):" + m.group(2) + "   ");
		}
	}
}