<div\sclass="div_z1">[\s\S]+?<A[^>]+>(?<user>.+?)</A></div>[\s\S]+?<div\sclass="comment_pftext">(?<service>.+?)</div>[\s\S]+?<div\sclass="comment_text"><b>(?<content>[\s\S]+?)<span[\s\S]+?>

------解决方案--------------------

第一个问题

C# code
MatchCollection mc = Regex.Matches(str, @"用户：(\s*<[^>]*>)*(?<user>[^<>]*)[\s\S]*?服务：\s*(?<service>\d+)[\s\S]*?价格：\s*(?<price>\d+)[\s\S]*?设施：\s*(?<est>\d+)", RegexOptions.IgnoreCase);
foreach (Match m in mc)
{
    richTextBox1.Text += m.Groups["user"].Value + "\n";
    richTextBox1.Text += m.Groups["service"].Value + "\n";
    richTextBox1.Text += m.Groups["price"].Value + "\n";
    richTextBox1.Text += m.Groups["est"].Value + "\n";
}