检测表单输入EMAIL的合法性

最新推荐文章于 2018-05-30 00:00:48 发布

原创最新推荐文章于 2018-05-30 00:00:48 发布 · 509 阅读

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CC 4.0 BY-SA版权

本文详细解析了一个用于检查邮箱地址语法是否有效的函数，包括如何使用Split函数分解@符号，判断邮件地址各部分的有效性，以及如何确保邮件地址的正确格式。

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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