这个问题确实很复杂, 用正则表达式是解决不了的, 用下面的代码可以解决
在页面分别放置 Button, WebBrowser, TextBox(多行)
        private void button1_Click(object sender, EventArgs e)
        {
            webBrowser1.Navigate("http://datainfo.stock.);
        }
        private void webBrowser1_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e)
        {
            HtmlDocument doc = webBrowser1.Document;
            HtmlElementCollection tables = doc.Body.GetElementsByTagName("TABLE");
            StringBuilder sb = new StringBuilder();
            foreach (HtmlElement table in tables)
            {
                HtmlElementCollection rows = table.GetElementsByTagName("TR");
                for (int i = 0; i < rows.Count; i++)
                {
                    HtmlElement row = rows[i];
                    HtmlElementCollection cells = row.GetElementsByTagName("TD");
                    
                    if (i == 0 && cells.Count != 8)
                        break;
                    for (int j = 0; j < cells.Count; j++)
                    {
                        HtmlElement cell = cells[j];
                        if (i == 0 && j == 0 && cell.InnerText != "股票名称")
                            break;
                        if(j<cells.Count-1)
                        {
                            sb.Append(cell.InnerText);
                            sb.Append(" ");
                        }
                        else
                        {
                            sb.AppendLine(cell.InnerText);
                        }
                    }
                }
            }
            textBox1.Text = sb.ToString();
        }