isValidIP

<%
    ' Copyright (c) 2008, reusablecode.blogspot.com; some rights reserved.
    '
    ' This work is licensed under the Creative Commons Attribution License. To view
    ' a copy of this license, visit http://creativecommons.org/licenses/by/3.0/ or
    ' send a letter to Creative Commons, 559 Nathan Abbott Way, Stanford, California
    ' 94305, USA.
 
    ' Validate an IP address.
    function isValidIP(ip)
        dim regEx
 
        set regEx = new RegExp
 
        with regEx
            .IgnoreCase = True
            .Global = True   
            .Pattern = "^([1]?\d{1,2}|2[0-4]{1}\d{1}|25[0-5]{1})(\.([1]?\d{1,2}|2[0-4]{1}\d{1}|25[0-5]{1})){3}$"
        end with
 
        if regEx.Test(trim(CStr(ip))) then
            isValidIP = True
        else
            isValidIP = False
        end if
 
        set regEx = nothing
    end function
%>