email验证

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

 email = trim(request("email"))
   if IsValidEmail(email)=false then
   Response.Write"<script Language='javascript'>alert('请输入正确的邮箱!');window.location.reload('reg.asp')</script>"
   response.end
   end if