c# 简单正则表达式求职！！！

Question

string html = "<td>3室 1厅 1卫 78平米</td>";
        Regex rmj = new Regex(@"<td>.*?室.*?(<mj>.*?)平米</td>", RegexOptions.IgnoreCase);
        Response.Write(rmj.Match(html).Groups["mj"].ToString());
 
怎么可以取出78来，我那样写不对呢

Answer 1

Regex rmj = new Regex(@"<td>.*?室.*?(?<mj>\d+)平米</td>", RegexOptions.IgnoreCase);

Answer 2

string html = "<td>3室 1厅 1卫 78平米</td>";
Regex rmj = new Regex(@"<td>.*?(?<mj>\d+)平米</td>", RegexOptions.IgnoreCase);
Response.Write(rmj.Match(html).Groups["mj"].ToString());//78