什么是电子邮件地址的最佳正则表达式验证 [英] Whats the best regex validation for email address

问题描述

我想使用正则表达式为我的注册表单添加电子邮件验证

I want to include email validation for my register form using regular expression

我已尝试使用此代码正则表达式来验证我的电子邮件

I've tried this code regex for validating my email

Dim ValidateEmail As Boolean
ValidateEmail = Regex.IsMatch(EmailAddress.Text, "^([\w]+)@([\w]+)\.([\w]+)$", RegexOptions.IgnoreCase)

我试图在我的电子邮件地址中输入一些电子邮件.文本是我的变量名，但在输入一些点后出现错误:[e-mail]在 Janus 之后，点是我得到的错误，但在我删除 [e-mail] 上的点之后，就可以了.

I tried to input some email in my EmailAddress. The text which is my variable name, but I got an error after putting some dot ex: [e-mail] after Janus the dot is the error I got but after I removed dot on [e-mail] then it's fine.

推荐答案

与其纠结于不可读、冗长、难以维护且难以维护的正则表达式，只需尝试创建 MailAddress 类以及您从用户那里获得的字符串.如果出现以下情况，它将抛出 FormatException格式无效.

Instead of messing about with unreadable, long, hard and unmaintainable regular expression, simply try to create an instance of the MailAddress class with the string you get from the user. It will throw a FormatException if the format is invalid.

这是一个简单的例子:

Function IsEmailAddressWellFormatted(ByVal address As String) As Boolean
    Try
        Dim address = New MailAddress(address)
        Return True
    Catch ex As FormatException
        Return False 
        ' We don't care about the actual exception here, 
        ' the fact that it's thrown is enough to know the string is not a valid format.
    End Try
End Function

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