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how to validate email id without using regular expression

Posted on 2008-06-26
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how to validate email id without using regular expressions.
USING:- MICROSOFT VISUAL STUDIO2005
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Question by:pooja
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4 Comments
 
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Éric Moreau earned 336 total points
ID: 21873722
Can I ask you why you don't want to use a regular expressions?

You can always use those rules:
-requires a @ character
-the @ character cannot be the first one
-a . is required after the @
-at least 1 character is required between the @ and the .
-at least 1 character is required after the .
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by:Dhaest
Dhaest earned 332 total points
ID: 21873724
Why aren't you using regular expressoins for it ?
Imports System.Text.RegularExpressions     
Function EmailAddressCheck(ByVal emailAddress As String) As Boolean
Dim pattern As String = "^[a-zA-Z][\w\.-]*[a-zA-Z0-9]@[a-zA-Z0-9][\w\.-]*[a-zA-Z0-9]\.[a-zA-Z][a-zA-Z\.]*[a-zA-Z]$"        
Dim emailAddressMatch As Match = Regex.Match(emailAddress, pattern)        
If emailAddressMatch.Success Then
            EmailAddressCheck = True
Else            
            EmailAddressCheck = False        
End If     
End Function

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by:joesthebighmoe
joesthebighmoe earned 332 total points
ID: 21874998
You can rely on the .Net framework....



public bool IsEmailValid(string iEmail)
{
  bool oIsEmailValid = true; //until proven false
    try
    {
      MailMessage Msg = new MailMessage();
      Msg.To.Add(iEmail);
    }
    catch
    {
      //Email addresses cannot be added if the mail message thinks they are invalid
      oIsEmailValid = false;
    }
    
    return oIsEmailValid;
}

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Expert Comment

by:joesthebighmoe
ID: 22204048
Usually I would not bother with this since so much opinion is involved, however your recommendation seems strange.
The user asked how to validate email without regular expressions.
emoreau & Dhaest both asked why you would not want to use regular expressions.
I actually answered his question.
That said, do what you will.
-Cheers,
Joe
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