email正则表达式函数

email正则表达式函数,是用来判断EMAIL是否正确,从而更好的给用户发邮件,通知等情况
Function IsValidEmail(email)
 Dim names, Name, i, c
 IsValidEmail = true
 names = Split(email, "@")
 If UBound(names) <> 1 Then
  IsValidEmail = false
  Exit Function
 End If
 For Each Name in names
  If Len(Name) <= 0 Then
   IsValidEmail = false
   Exit Function
  End If
  For i = 1 To Len(Name)
   c = LCase(Mid(Name, i, 1))
   If InStr("abcdefghijklmnopqrstuvwxyz_-.", c) <= 0 And Not IsNumeric(c) Then
    IsValidEmail = false
    Exit Function
   End If
  Next
  If Left(Name, 1) = "." Or Right(Name, 1) = "." Then
   IsValidEmail = false
   Exit Function
  End If
 Next
 If InStr(names(1), ".") <= 0 Then
  IsValidEmail = false
  Exit Function
 End If
 i = Len(names(1)) - InStrRev(names(1), ".")
 If i <> 2 And i <> 3 Then
  IsValidEmail = false
  Exit Function
 End If
 If InStr(email, "..") > 0 Then
  IsValidEmail = false
 End If

End Function