ASP验证EMAIL地址格式合法性

继php验证email和js验证email地址格式之后，再说一下ASP验证EMAIL地址格式
的函数:

<%
'验证函数
function IsValidEmail(email)

dim names, name, i, c

'Check for valid syntax in an email address.
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
'使用示例
email=request.form("email")
if IsValidEmail(email)=false then
response.write"<SCRIPT language=JavaScript>alert('邮箱地址格式不正确');"
response.write"javascript:history.go(-1)</SCRIPT>"
response.End
end if

%>