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# Code to validate an e-mail address in vb6

Posted on 2001-06-25
Medium Priority
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Code to validate an e-mail address in vb6
0
Question by:global819
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LVL 5

Expert Comment

ID: 6225174
you can use instr to search for @, . , com or net
0

LVL 20

Expert Comment

ID: 6225318
have a look at this example

http://cuinl.tripod.com/Tips/string1.htm
0

LVL 53

Accepted Solution

Ryan Chong earned 200 total points
ID: 6225916
Hi, here is a sample:

Dim IsValid As Boolean
Dim InvalidReason As String

MsgBox "Is the e-mail address valid? - " & IsValid

MsgBox "If invalid, the reason given is: " & InvalidReason

_______________________________________________________

Public Function IsEMailAddress(ByVal sEmail As String, _
Optional ByRef sReason As String) As Boolean

Dim sPreffix As String
Dim sSuffix As String
Dim sMiddle As String
Dim nCharacter As Integer
Dim sBuffer As String

sEmail = Trim(sEmail)

If Len(sEmail) < 8 Then
sReason = "Too short"
Exit Function
End If

If InStr(sEmail, "@") = 0 Then
sReason = "Missing the @"
Exit Function
End If

If InStr(InStr(sEmail, "@") + 1, sEmail, "@") <> 0 Then
sReason = "Too many @"
Exit Function
End If

If InStr(sEmail, ".") = 0 Then
sReason = "Missing the period"
Exit Function
End If

If InStr(sEmail, "@") = 1 Or InStr(sEmail, "@") = Len(sEmail) Or _
InStr(sEmail, ".") = 1 Or InStr(sEmail, ".") = Len(sEmail) Then
sReason = "Invalid format"
Exit Function

End If

For nCharacter = 1 To Len(sEmail)
sBuffer = Mid\$(sEmail, nCharacter, 1)
If Not (LCase(sBuffer) Like "[a-z]" Or sBuffer = "@" Or _
sBuffer = "." Or sBuffer = "-" Or sBuffer = "_" Or _
False: sReason = "Invalid character": Exit Function
Next nCharacter

nCharacter = 0

On Error Resume Next

sBuffer = Right(sEmail, 4)
If InStr(sBuffer, ".") = 0 Then GoTo TooLong:
If Left(sBuffer, 1) = "." Then sBuffer = Right(sBuffer, 3)
If Left(Right(sBuffer, 3), 1) = "." Then sBuffer = Right(sBuffer, 2)
If Left(Right(sBuffer, 2), 1) = "." Then sBuffer = Right(sBuffer, 1)

If Len(sBuffer) < 2 Then
sReason = "Suffix too short"
Exit Function
End If

TooLong:

If Len(sBuffer) > 3 Then
sReason = "Suffix too long"
Exit Function
End If

sReason = Empty

End Function
0

LVL 1

Expert Comment

ID: 6226455
u can try this too

Dim v1, v2
If Len(email.Text) = 0 Then
DoEvents
ElseIf Len(email.Text) > 0 Then
v2 = (InStr(1, email.Text, "@", vbTextCompare))
v1 = (InStr(1, email.Text, ".", vbTextCompare))

If ((v2 > 0) And (v1 > 0)) Then
DoEvents
Else
MsgBox "Invalid ID", , "Email"
email.SetFocus
email.Text = ""
End If
End If

I use this code in my projects
0

LVL 49

Expert Comment

ID: 7139799
Hi global819,
It appears that you have forgotten this question. I will ask Community Support to close it unless you finalize it within 7 days. I will suggest to:

Accept ryancys's comment(s) as an answer.

global819, if you think your question was not answered at all or if you need help, you can simply post a new comment here.  Community Support moderators will follow up.

EXPERTS: If you disagree with that recommendation, please post an explanatory comment.
==========
DanRollins -- EE database cleanup volunteer
0

Author Comment

ID: 7140561
Thank you Randys
0

LVL 6

Expert Comment

ID: 7144523
The answer is complete. I think that was a 'default' B, so I will change the grade to 'A'.

** Mindphaser - Community Support Moderator **
0

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