001/* 002 * Licensed to the Apache Software Foundation (ASF) under one or more 003 * contributor license agreements. See the NOTICE file distributed with 004 * this work for additional information regarding copyright ownership. 005 * The ASF licenses this file to You under the Apache License, Version 2.0 006 * (the "License"); you may not use this file except in compliance with 007 * the License. You may obtain a copy of the License at 008 * 009 * http://www.apache.org/licenses/LICENSE-2.0 010 * 011 * Unless required by applicable law or agreed to in writing, software 012 * distributed under the License is distributed on an "AS IS" BASIS, 013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 014 * See the License for the specific language governing permissions and 015 * limitations under the License. 016 */ 017package org.apache.wicket.validation.validator; 018 019import java.util.regex.Pattern; 020 021/** 022 * Validator for checking the form/pattern of email addresses. 023 * 024 * NOTICE: This validator only checks the most commonly used email address patterns. For a validator 025 * that can check the entire range of rfc compliant email addresses see 026 * <code>org.apache.wicket.extensions.validation.validator.RfcCompliantEmailAddressValidator</code> 027 * 028 * <p>Also see org.apache.wicket.extensions.validation.validator.RfcCompliantEmailAddressValidator</p> 029 * 030 * @author Chris Turner 031 * @author Jonathan Locke 032 * @author Martijn Dashorst 033 * @author Al Maw 034 * 035 * 036 * @since 1.3 037 */ 038public class EmailAddressValidator extends PatternValidator 039{ 040 private static final long serialVersionUID = 1L; 041 042 /** singleton instance */ 043 private static final EmailAddressValidator INSTANCE = new EmailAddressValidator(); 044 045 /** 046 * Retrieves the singleton instance of <code>EmailAddressValidator</code>. 047 * 048 * @return the singleton instance of <code>EmailAddressValidator</code> 049 */ 050 public static EmailAddressValidator getInstance() 051 { 052 return INSTANCE; 053 } 054 055 /** 056 * Protected constructor to force use of static singleton accessor. Override this constructor to 057 * implement resourceKey(Component). 058 */ 059 protected EmailAddressValidator() 060 { 061 super( 062 "^[_A-Za-z0-9-]+(\\.[_A-Za-z0-9-]+)*@[A-Za-z0-9-]+(\\.[A-Za-z0-9-]+)*((\\.[A-Za-z]{2,}){1}$)", 063 Pattern.CASE_INSENSITIVE); 064 } 065}