http://groups.google.com/group/elmah/t/5973570fa5384880

Test.cs

using System;
using System.Collections.Specialized;
using System.Xml;
using Elmah.Assertions;

static class Program
{
    static void Main()
    {
        var config = new XmlDocument();
        config.LoadXml(@"
            <or>
                <equal binding='Context.Request.ServerVariables[&apos;SERVER_NAME&apos;]' value='localhost' type='String' />
                <equal binding='Context.Request.ServerVariables[&apos;SERVER_NAME&apos;]' value='10.10.2.101' type='String' />
                <equal binding='Context.Request.ServerVariables[&apos;SERVER_NAME&apos;]' value='10.10.5.10' type='String' />
                <and>
                    <regex binding='Context.Request.ServerVariables[&apos;HTTP_USER_AGENT&apos;]' pattern='Trident\/4\.0' />
                    <equal binding='Context.Request.ServerVariables[&apos;URL&apos;]' value='/MyApp/ScriptResource.axd' type='String' />
                </and>
            </or>");

        var assertion = AssertionFactory.Create(config.DocumentElement);

        var context = new
        {
            Context = new
            {
                Request = new
                {
                    ServerVariables = new NameValueCollection {
                        { "SERVER_NAME", "localhost" },
                        { "HTTP_USER_AGENT", "Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.0; Trident/4.0)" },
                        { "URL", "/MyApp/ScriptResource.axd" },
                    }
                }
            }
        };
        Console.WriteLine("Filter matched? " + assertion.Test(context));
    }
}