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/*
 * Copyright 2000-2014 Vaadin Ltd.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 * 
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */
package com.vaadin.data.validator;

/**
 * String validator for e-mail addresses. The e-mail address syntax is not
 * complete according to RFC 822 but handles the vast majority of valid e-mail
 * addresses correctly.
 * 
 * See {@link com.vaadin.data.validator.AbstractStringValidator} for more
 * information.
 * 
 * 
 * An empty string or a null is always accepted - use the required flag on
 * fields or a separate validator (or override {@link #isValidValue(String)}) to
 * fail on empty values.
 * 
 * 
 * @author Vaadin Ltd.
 * @since 5.4
 */
@SuppressWarnings("serial")
public class EmailValidator extends RegexpValidator {

    /**
     * Creates a validator for checking that a string is a syntactically valid
     * e-mail address.
     * 
     * @param errorMessage
     *            the message to display in case the value does not validate.
     */
    public EmailValidator(String errorMessage) {
        super(
                "^([a-zA-Z0-9_\\.\\-+])+@(([a-zA-Z0-9-])+\\.)+([a-zA-Z0-9]{2,4})+$",
                true, errorMessage);
    }
}