Email Address Validation

[Guest]

Hi

How to validate an email address in windows application

Thanks in advance

 

[Sparky]

Public Shared Function IsValidEmail(ByVal strIn As String) As Boolean

' Return true if strIn is in valid e-mail format.

Return Regex.IsMatch(strIn,
("^([\w-\.]+)@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.)|(([\w-]+\.)+))([a-zA
-Z]{2,4}|[0-9]{1,3})(\]?)$"))

End Function

 

[Guest]

Hi
It's giving me error that "Regex" is not declared.....

 

[Sparky]

Oops!!!

Either add
Imports System.Text.RegularExpressions

to the top of your class, or add System.Text.RegularExpressions. to the
front of regex

 

[Guest]

Thanks a lot!!!!!

It worked.......

 

[_]

Public Shared Function IsValidEmail(ByVal strIn As String) As Boolean

' Return true if strIn is in valid e-mail format.

Return Regex.IsMatch(strIn,
("^([\w-\.]+)@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.)|(([\w-]+\.)+))([a-zA
-Z]{2,4}|[0-9]{1,3})(\]?)$"))

End Function

There are many valid email addresses that expression will not validate. The
only serious regex attempt I've seen to match an address, according to the
relevant RFC, was about an entire page long.

 

[Jay]

Your best bet is to verify the email address by using a powerful email
validation webservice. This will tell if the email address exists on the
remote mail server. I remember seeing one a while ago. I'll see if I can
find the address for you.

Public Shared Function IsValidEmail(ByVal strIn As String) As Boolean

' Return true if strIn is in valid e-mail format.

Return Regex.IsMatch(strIn,
("^([\w-\.]+)@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.)|(([\w-]+\.)+))([a-z

A

-Z]{2,4}|[0-9]{1,3})(\]?)$"))

End Function

There are many valid email addresses that expression will not validate. The
only serious regex attempt I've seen to match an address, according to the
relevant RFC, was about an entire page long.


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