string html = “html代码”;

        Regex reg = new Regex(@"(?is)<a[^>]*?href=(['""]?)(?<url>[^'""\s>]+)\1[^>]*>(?<text>(?:(?!</?a\b).)*)</a>");

        MatchCollection mc = reg.Matches(html);foreach (Match m in mc)

        {

            string url = m.Groups["url"].Value;

            string text = m.Groups["text"].Value;

        }