Simple mail Validator...

import java.util.regex.Matcher;
import java.util.regex.Pattern;
/**
 *
 * @author Home
 */
class MailIDValidation
{
 public static void main(String args[])
 {
 //Input the string for validation
 String email = "mymailsafgkjs.gs.gmail.com";
 //Set the email pattern string
 Pattern p = Pattern.compile(".+@.+\\.[a-z]+");
 //Match the given string with the pattern
 Matcher m = p.matcher(email);
 //check whether match is found
 boolean matchFound = m.matches();
 if (matchFound)
 System.out.println("Valid Email Id.");
 else
 System.out.println("Invalid Email Id.");
 }
 }