USPTO Search

StringExtensions.cs

public static class StringExtensions
{
    public static string StripHtml(this string value)
    {
        return Regex.Replace(value, @"<[^>]+>|&nbsp;", "").Trim();
    }
}

TrademarkSearch.cs

public class Trademark
{
    public string SerialNumber { get; set; }
    public string RegistrationNumber { get; set; }
    public string WordMark { get; set; }
    public string Status { get; set; }
    public string Url { get; set; }
}

public interface ITrademarkSearch
{
    List<Trademark> Search(string query);
}

public class TrademarkSearch : ITrademarkSearch
{
    private const string ResultsRegex = 
        @"(<TR>\s*?" + 
            @"<TD>\d.*<\/TD>\s*?" +
            @"<TD>\s*?<a.*?>(.*?)<\/a>\s*?<\/TD>\s*?" +
            @"<TD>\s*?<a.*?>(.*?)<\/a>\s*?<\/TD>\s*?" +
            @"<TD>\s*?<a.*?>(.*?)<\/a>\s*?<\/TD>\s*?" +
            @"<TD>\s*?<a HREF=""(.*?)"">.*?<\/a>\s*?<\/TD>\s*?" +
            @"<TD>\s*?<a.*?>(.*?)<\/a>\s*?<\/TD>(.|\s)*?" +
        @"<\/TR>).*";

    public List<Trademark> Search(string query)
    {
        // TODO: Add caching
        using (var client = new WebClient())
        {
            var response = Encoding.UTF8.GetString(client
                .UploadData("http://tmsearch.uspto.gov/bin/gate.exe ",
                Encoding.UTF8.GetBytes("f=toc&p_lang=english&p_d=trmk&p_L=500" +
                    $"&p_plural=yes&p_s_ALL={query}&a_search=Submit Query")));
            var results = new Regex(ResultsRegex, RegexOptions.IgnoreCase | 
                RegexOptions.Multiline).Matches(response);
            return results.Cast<Match>().Select(x => new Trademark
            {
                SerialNumber = x.Groups[2].Value.StripHtml(),
                RegistrationNumber = x.Groups[3].Value.StripHtml(),
                WordMark = x.Groups[4].Value.StripHtml(),
                Url = x.Groups[5].Value,
                Status = x.Groups[6].Value.StripHtml()
            }).ToList();
        }
    }
}

TrademarkSearchTests.cs

[TestFixture]
public class TrademarkSearchTests
{
    [Test]
    public void Should_return_search_results()
    {
        var results = new TrademarkSearch().Search("(fark)[COMB]");
        results.Count.ShouldBeGreaterThanOrEqualTo(8);
        var result = results.FirstOrDefault(x => x.SerialNumber == "77326033");

        result.ShouldNotBeNull();
        result.RegistrationNumber.ShouldEqual("3501114");
        result.WordMark.ShouldEqual("IT'S NOT NEWS, IT'S FARK.COM");
        result.Status.ShouldEqual("LIVE");
        result.Url.ShouldEqual("http://tsdr.uspto.gov/#caseNumber=77326033" +
                                "&caseType=SERIAL_NO&searchType=statusSearch");
    }
}