How to Validate Email Address using Java Pattern

Validate an email address is easy if you have good valid pattern expression.   

package com.jsupport;

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

/**
 *
 * @author JSupport
 */
public class ValidateEmailAddress {

    public boolean isValidEmailAddress(String emailAddress) {
        
        String expression = "^[\\w\\-]([\\.\\w])+[\\w]+@([\\w\\-]+\\.)+[A-Z]{2,4}$";
        CharSequence inputStr = emailAddress;
        Pattern pattern = Pattern.compile(expression, Pattern.CASE_INSENSITIVE);
        Matcher matcher = pattern.matcher(inputStr);
        return matcher.matches();
        
    }

    public static void main(String[] args) {
        
        ValidateEmailAddress vea = new ValidateEmailAddress();

        System.out.println(vea.isValidEmailAddress("info@jsupport.info"));      // Valide emaill address
        System.out.println(vea.isValidEmailAddress("info@jsup@port.info"));     // Invalide emaill address
        System.out.println(vea.isValidEmailAddress("info@jsupport.in_fo"));     // Invalide emaill address
        System.out.println(vea.isValidEmailAddress("in@fo@jsupport.info"));     // Invalide emaill address
        System.out.println(vea.isValidEmailAddress("info@jsupport.com.lk"));    // Valide emaill address
    }
}

Here you will find how to validate email address using Java Mail API