Email address validation at client and server side

Email validation at client side(Java Script)
function validateEmailAddress(emailAddress) { 
    var expression = /^(([^<>()[\]\\.,;:\s@\"]+(\.[^<>()[\]\\.,;:\s@\"]+)*)|(\".+\"))@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\])|(([a-zA-Z\-0-9]+\.)+[a-zA-Z]{2,}))$/;

    return expression.test(email);

This function will return true if it is a valid email address otherwise false if it is invalid email address.

Email validation at server side using Java

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

public class EmailAddressValidator{

 private Pattern pattern;
 private Matcher matcher;

 private static final String EMAIL_ADDRESS_PATTERN = "^[_A-Za-z0-9-]+(\\.[_A-Za-z0-9-]+)*@[A-Za-z0-9]+(\\.[A-Za-z0-9]+)*(\\.[A-Za-z]{2,})$";

 public EmailAddressValidator(){
 pattern = Pattern.compile(EMAIL_ADDRESS_PATTERN);

 public boolean validate(final String emailId){ 
 matcher = pattern.matcher(emailId);
 return matcher.matches();

 public static void main(String [] arg){
 String emailId="";  
 EmailAddressValidator validatorObj=new EmailAddressValidator();
 System.out.println("-validate email address:"+emailId+": ---is it proper email:"+validatorObj.validate(emailId));
 emailId="abc @";
 System.out.println("-validate email address:"+emailId+": ---is it proper email:"+validatorObj.validate(emailId));
At server side you can use this class as a utility class and use wherever you want.

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