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Here you can find some FREE usefull Classic ASP / VBScript code snippets, class modules, etc.
I use then myself on most of my projects, so you can rest assured they were optimized over time and are very reliable.
You can use them on your personal or commercial projects.
If you find them usefull to you, please make a donation (nomatter how small) to help me keep this content online for free.

Function IsValidEmail(String)Boolean The must-have email address format validation function. Returns True or False.

Example

<%
if IsValidEmail(request.form("email")) then
   response.write "Email address OK!"
   else
   response.write "Invalid email address!"
   end if
%>

Source Code

<%
function IsValidEmail(e)
dim re
set re = new RegExp
re.pattern="^([0-9a-zA-Z]([-.\w]*[0-9a-zA-Z])*@([0-9a-zA-Z][-\w]*[0-9a-zA-Z]\.)+[a-zA-Z]{2,9})$"
IsValidEmail=re.Test(e)
set re=nothing
end function
%>