邮件表达验证问题 [英] Email expression validation problem

问题描述

嗨朋友们，



我有两个表达式来验证电子邮件ID

＃1^ [a-zA-Z0- 9_ \\ + - ] +（\\。[a-zA-Z0-9_ \\ + - ] +）* @ [a-zA-Z0-9-]

+（\\。[a-zA-Z0-9 - ] +）* \\。（[a-zA-Z] {2,4}）$



＃2Regex.IsMatch（viewmodel.Email，@^ [\w-\。] + @（[\\\ - ] + \。）+ [\ w - ] {2,4} $）





问题是＃1验证表达式总是成功。但是＃2验证表达式在某些情况下是失败的。



1.为什么表达式＃2失败

2.哪个表达式（＃1和＃2）是最好用



请帮忙解决这个问题。



谢谢，

Shanmuga Raja



我的尝试：



我不知道为什么Regex.IsMatch（viewmodel.Email，@^ [\w-\。] + @（[\w - ] + \。）+ [\w - ] {2,4} $） 失败。

Hi Friends,

I have two expression to validate the email ID
#1 "^[a-zA-Z0-9_\\+-]+(\\.[a-zA-Z0-9_\\+-]+)*@[a-zA-Z0-9-]
+(\\.[a-zA-Z0-9-]+)*\\.([a-zA-Z]{2,4})$"

#2 "Regex.IsMatch(viewmodel.Email, @"^[\w-\.]+@([\w-]+\.)+[\w-]{2,4}$)"


The Problem is #1 validation expression always successful. But #2 validation expression is fail in some case.

1. why expression #2 is fail
2. Which expression ( #1 and #2) is best to use

Please help in this issue.

Thanks,
Shanmuga Raja

What I have tried:

I dont Know why "Regex.IsMatch(viewmodel.Email, @"^[\w-\.]+@([\w-]+\.)+[\w-]{2,4}$)" gets fail.

推荐答案

＃2Regex.IsMatch（viewmodel.Email，@^ [\w-\。] + @（[\\\ - ] + \。）+ [\ w-] {2,4}

"

#2 "Regex.IsMatch(viewmodel.Email, @"^[\w-\.]+@([\w-]+\.)+[\w-]{2,4}

）





问题是＃1验证表达总是成功的。但是＃2验证表达式在某些情况下是失败的。



1.为什么表达式＃2失败

2.哪个表达式（＃1和＃2）最好使用



请帮忙解决这个问题。



谢谢，

Shanmuga Raja



我尝试过：



我不知道为什么Regex.IsMatch（viewmodel.Email，@^ [\w-\。] + @（[\w - ] + \。）+ [\w - ] {2 ，4}

)"


The Problem is #1 validation expression always successful. But #2 validation expression is fail in some case.

1. why expression #2 is fail
2. Which expression ( #1 and #2) is best to use

Please help in this issue.

Thanks,
Shanmuga Raja

What I have tried:

I dont Know why "Regex.IsMatch(viewmodel.Email, @"^[\w-\.]+@([\w-]+\.)+[\w-]{2,4}

）失败。

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