Program: How to validate email address using regular expression?

The below given example shows how to validate a email address using regular expression.

package com.java2novice.regex;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class MyEmailValidate {

	private static Pattern emailNamePtrn = Pattern.compile(
	"^[_A-Za-z0-9-]+(\\.[_A-Za-z0-9-]+)*@[A-Za-z0-9]+(\\.[A-Za-z0-9]+)*(\\.[A-Za-z]{2,})$");
	
	public static boolean validateEmailAddress(String userName){
		
		Matcher mtch = emailNamePtrn.matcher(userName);
		if(mtch.matches()){
			return true;
		}
		return false;
	}
	
	public static void main(String a[]){
		System.out.println("Is '[email protected]' a valid email address? "
									+validateEmailAddress("[email protected]"));
		System.out.println("Is 'cric*7*[email protected]' a valid email address? "
									+validateEmailAddress("cric*7*[email protected]"));
		System.out.println("Is 'JAVA2NOVICE.gmail.com' a valid email address? "
									+validateEmailAddress("JAVA2NOVICE.gmail.com"));
	}
}

Is '[email protected]' a valid email address? true
Is 'cric*7*[email protected]' a valid email address? false
Is 'JAVA2NOVICE.gmail.com' a valid email address? false