Java Email Validate isValidEmail(final String email)

Description

Indicates wether a given string is a valid email address

Email format is :

starts with A-Za-z or '-'

then has any number of A-Za-z (can be zero)

has any number of '.'

License

Open Source License

Parameter

Parameter	Description
email	the string to validate

Return

true if the string is a valid email address, false otherwise

Declaration

public static boolean isValidEmail(final String email)

Method Source Code


//package com.java2s;
// under the terms of the GNU General Public License as published by the

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

public class Main {
    /**//from  ww w.  j  a v  a2  s.c  o  m
     * <p>
     * Indicates wether a given string is a valid email address
     * </p>
     * <p>
     * Email format is :
     * <li>starts with A-Za-z or '-'</li>
     * <li>then has any number of A-Za-z (can be zero)</li>
     * <li>has any number of '.' followed by one of more characters</li>
     * <li>has an '@'</li>
     * <li>has any number of A-Za-z0-9</li>
     * <li>has a '.' then 2 to 4 A-Za-z</li>
     * </p>
     * 
     * @param email the string to validate
     * @return <code>true</code> if the string is a valid email address,
     *         <code>false</code> otherwise
     */
    public static boolean isValidEmail(final String email) {
        final String expression = "^(?:[a-z0-9!#$%&'*+/=?^_`{|}~-]+(?:\\.[a-z0-9!#$%&'*+/=?^_`{|}~-]+)*|\"(?:[\\x01-\\x08\\x0b\\x0c\\x0e-\\x1f\\x21\\x23-\\x5b\\x5d-\\x7f]|\\\\[\\x01-\\x09\\x0b\\x0c\\x0e-\\x7f])*\")"
                + "@(?:(?:[a-z0-9](?:[a-z0-9-]*[a-z0-9])?\\.)+[a-z0-9](?:[a-z0-9-]*[a-z0-9])?|\\[(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?|[a-z0-9-]*[a-z0-9]:(?:[\\x01-\\x08\\x0b\\x0c\\x0e-\\x1f\\x21-\\x5a\\x53-\\x7f]|\\\\[\\x01-\\x09\\x0b\\x0c\\x0e-\\x7f])+)\\])$";
        final Pattern pattern = Pattern.compile(expression);

        final Matcher matcher = pattern.matcher(email);
        return matcher.matches();
    }
}