The following code demonstrates how to validate email using regular expression:

import java.util.regex.*;class regexSample {   public static void main(String args[])    {      //Input the string for validation      String email = "[email protected]";      //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.");   }}

Editor’s Note: This tip can incorrectly validate some malformed email addresses. You can find an updated version here.