電子郵件正則表達式模式

^[_A-Za-z0-9-\\+]+(\\.[_A-Za-z0-9-]+)*@[A-Za-z0-9-]+(\\.[A-Za-z0-9]+)*(\\.[A-Za-z]{2,})$;

描述

^ #start of the line[_A-Za-z0-9-\\+]+ # must start with string in the bracket [ ], must contains one or more (+)( # start of group #1\\.[_A-Za-z0-9-]+ # follow by a dot "." and string in the bracket [ ], must contains one or more (+))* # end of group #1, this group is optional (*)@ # must contains a "@" symbol[A-Za-z0-9-]+ # follow by string in the bracket [ ], must contains one or more (+)( # start of group #2 - first level TLD checking\\.[A-Za-z0-9]+ # follow by a dot "." and string in the bracket [ ], must contains one or more (+))* # end of group #2, this group is optional (*)( # start of group #3 - second level TLD checking\\.[A-Za-z]{2,} # follow by a dot "." and string in the bracket [ ], with minimum length of 2) # end of group #3 $ #end of the line

組合方式表示，電子郵件地址必須以“ _A-Za-z0-9-\\ +”開頭，可選后跟“。[_ A-Za-z0-9--]”，并以“ @”符號結尾。 電子郵件的域名必須以“ A-Za-z0-9-”開頭，后跟第一級Tld（.com，.net）“。[A-Za-z0-9]”，并可選地后跟第二級Tld （.com.au，.com.my）“ \\。[A-Za-z] {2，}”，其中第二級Tld必須以點“。”開頭。 并且長度必須等于或大于2個字符。

1. Java正則表達式示例

這是一個Java示例，向您展示如何使用正則表達式來驗證電子郵件地址。

EmailValidator.java package com.mkyong.regex;import java.util.regex.Matcher; import java.util.regex.Pattern;public class EmailValidator {private Pattern pattern;private Matcher matcher;private static final String EMAIL_PATTERN = "^[_A-Za-z0-9-\\+]+(\\.[_A-Za-z0-9-]+)*@"+ "[A-Za-z0-9-]+(\\.[A-Za-z0-9]+)*(\\.[A-Za-z]{2,})$";public EmailValidator() {pattern = Pattern.compile(EMAIL_PATTERN);}/*** Validate hex with regular expression* * @param hex* hex for validation* @return true valid hex, false invalid hex*/public boolean validate(final String hex) {matcher = pattern.matcher(hex);return matcher.matches();} }

2.有效的電子郵件

1. mkyong @ yahoo.com，mkyong-100 @ yahoo.com，mkyong.100 @ yahoo.com
2. mkyong111@mkyong.com，mkyong-100@mkyong.net，mkyong.100@mkyong.com.au
3. mkyong@1.com，mkyong@gmail.com.com
4. mkyong + 100 @ gmail.com，mkyong-100 @ yahoo-test.com

3.無效的電子郵件

1. mkyong –必須包含“ @”符號
2. mkyong @ .com.my – tld不能以點“。”開頭
3. mkyong123@gmail.a –“ .a”不是有效的tld，最后一個tld必須包含至少兩個字符
4. mkyong123 @ .com – tld不能以點“。”開頭
5. mkyong123 @ .com.com – tld不能以點“。”開頭
6. .mkyong @ mkyong.com –電子郵件的首字符不能以點“。”開頭
7. mkyong（）* @ gmail.com –電子郵件僅允許使用字符，數(shù)字，下劃線和破折號
8. mkyong@%*.com –電子郵件的tld僅允許使用字符和數(shù)字
9. mkyong..2002 @ gmail.com-雙點“。” 不允許
10. mkyong。@ gmail.com –電子郵件的最后一個字符不能以點“。”結尾
11. mkyong @ mkyong @ gmail.com –不允許使用雙“ @”
12. mkyong@gmail.com.1a-具有兩個字符的電子郵件的tld不能包含數(shù)字

4.單元測試

這是使用testNG的單元測試。

EmailValidatorTest.java package com.mkyong.regex;import org.testng.Assert; import org.testng.annotations.*;/*** Email validator Testing* * @author mkyong* */ public class EmailValidatorTest {private EmailValidator emailValidator;@BeforeClasspublic void initData() {emailValidator = new EmailValidator();}@DataProviderpublic Object[][] ValidEmailProvider() {return new Object[][] { { new String[] { "mkyong@yahoo.com","mkyong-100@yahoo.com", "mkyong.100@yahoo.com","mkyong111@mkyong.com", "mkyong-100@mkyong.net","mkyong.100@mkyong.com.au", "mkyong@1.com","mkyong@gmail.com.com", "mkyong+100@gmail.com","mkyong-100@yahoo-test.com" } } };}@DataProviderpublic Object[][] InvalidEmailProvider() {return new Object[][] { { new String[] { "mkyong", "mkyong@.com.my","mkyong123@gmail.a", "mkyong123@.com", "mkyong123@.com.com",".mkyong@mkyong.com", "mkyong()*@gmail.com", "mkyong@%*.com","mkyong..2002@gmail.com", "mkyong.@gmail.com","mkyong@mkyong@gmail.com", "mkyong@gmail.com.1a" } } };}@Test(dataProvider = "ValidEmailProvider")public void ValidEmailTest(String[] Email) {for (String temp : Email) {boolean valid = emailValidator.validate(temp);System.out.println("Email is valid : " + temp + " , " + valid);Assert.assertEquals(valid, true);}}@Test(dataProvider = "InvalidEmailProvider", dependsOnMethods = "ValidEmailTest")public void InValidEmailTest(String[] Email) {for (String temp : Email) {boolean valid = emailValidator.validate(temp);System.out.println("Email is valid : " + temp + " , " + valid);Assert.assertEquals(valid, false);}} }

這是單元測試結果。

Email is valid : mkyong@yahoo.com , true Email is valid : mkyong-100@yahoo.com , true Email is valid : mkyong.100@yahoo.com , true Email is valid : mkyong111@mkyong.com , true Email is valid : mkyong-100@mkyong.net , true Email is valid : mkyong.100@mkyong.com.au , true Email is valid : mkyong@1.com , true Email is valid : mkyong@gmail.com.com , true Email is valid : mkyong+100@gmail.com , true Email is valid : mkyong-100@yahoo-test.com , true Email is valid : mkyong , false Email is valid : mkyong@.com.my , false Email is valid : mkyong123@gmail.a , false Email is valid : mkyong123@.com , false Email is valid : mkyong123@.com.com , false Email is valid : .mkyong@mkyong.com , false Email is valid : mkyong()*@gmail.com , false Email is valid : mkyong@%*.com , false Email is valid : mkyong..2002@gmail.com , false Email is valid : mkyong.@gmail.com , false Email is valid : mkyong@mkyong@gmail.com , false Email is valid : mkyong@gmail.com.1a , false PASSED: ValidEmailTest([Ljava.lang.String;@15f48262) PASSED: InValidEmailTest([Ljava.lang.String;@789934d4)===============================================Default testTests run: 2, Failures: 0, Skips: 0 ===============================================

參考文獻

http://en.wikipedia.org/wiki/電子郵件地址

http://tools.ietf.org/html/rfc2822#section-3.4.1

標簽： 電子郵件 正則表達式

翻譯自: https://mkyong.com/regular-expressions/how-to-validate-email-address-with-regular-expression/

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