by Pranabesh Sinha (1 Submission)
Category: String Manipulation
Compatability: VB 6.0
Difficulty: Unknown Difficulty
Originally Published: Tue 15th July 2003
Date Added: Mon 8th February 2021
Rating: 
(1 Votes)
E-Mail validation
API Declarations
Dim lenstr As String
Dim atchk As Boolean
Dim decchk As Boolean
Dim i As Integer
Dim strs As String
Dim stre As String
Dim rags As String
Dim hars As String
Dim strinat As String
Dim strindec As String
Dim strmidat As String
Dim strmiddec As String
Dim ans As String
VBcoders
'**********************************************************
'Email Validation: Allowed only small letters,numerals,@,.
'Email format should be "[email protected]"
'First checks for any @ Or . characters occures in string then
'findis the last and first character of the string
'finds "@." or ".@" are together then it is Correct Email format.
'Otherwise it is wrong email format.
'**********************************************************
Dim chkdec As String
Dim count1 As Integer
count1 = 0
lenstr = Len(txt_email.Text)
For i = 1 To lenstr
chkdec = Mid(txt_email, i, (Len(txt_email) - ((lenstr) - 1)))
If chkdec = "." Then
count1 = count1 + 1
If count1 >= 3 Then
MsgBox "Wrong Email Format"
txt_email.SetFocus
Exit Function
End If
End If
Next i
atchk = InStr(1, txt_email.Text, "@")
decchk = InStr(1, txt_email.Text, ".")
If atchk = True And decchk = True Then
For i = 1 To lenstr
strs = Left(txt_email.Text, 1)
stre = Right(txt_email.Text, 1)
strinat = InStr(1, txt_email.Text, "@")
strmidat = Mid(txt_email.Text, strinat, lenstr)
strindec = InStr(1, txt_email.Text, ".")
strmiddec = Mid(txt_email.Text, strindec, lenstr)
If Val(strinat) > Val(strindec) Then
MsgBox "Wrong Email Format"
txt_email.SetFocus
Exit Function
End If
ans = Mid(txt_email, strindec, (Len(strindec) + 1))
If ans = ".." Then
MsgBox "Wrong Email Format"
txt_email.SetFocus
Exit Function
End If
rags = Mid(strmidat, 1, 2)
hars = Mid(strmiddec, 1, 2)
Next i
' rags = Mid(Mid(txt_email.Text, InStr(1, txt_email.Text, "@"), lenstr), 1, 2)
' hars = Mid(Mid(txt_email.Text, InStr(1, txt_email.Text, "."), lenstr), 1, 2)
If strs = "@" Or stre = "." Or strs = "@" Or stre = "." Then
MsgBox "Wrong Email Format"
txt_email.SetFocus
Exit Function
ElseIf rags = "@." Or hars = ".@" Then
MsgBox "Wrong Email Format"
txt_email.SetFocus
Exit Function
End If
Else
MsgBox "Wrong Email Format"
txt_email.SetFocus
Exit Function
End If
