正则 提取html标签value

using System.Text.RegularExpressions;

//step2: extract expected info

//<h1 class="h1user">crifan</h1>

string h1userP = @"<h1\s+class=""h1user"">(?<h1user>.+?)</h1>";

Match foundH1user = (newRegex(h1userP)).Match(rtbExtractedHtml.Text);

if (foundH1user.Success)

{

    //extracted the expected h1user's value

    txbExtractedInfo.Text = foundH1user.Groups["h1user"].Value;

}

else

{

    txbExtractedInfo.Text = "Not found h1 user !";

}