从html文本中获取所有img标签

using System.Text.RegularExpressions;List<string> list=new List<string>();                    Regex reg=new Regex(@"<img\b[^<>]*?\bsrc[\s\t\r\n]*=[\s\t\r\n]*[""']?[\s\t\r\n]*(?<imgUrl>[^\s\t\r\n""'<>]*)[^<>]*?/?[\s\t\r\n]*>", RegexOptions.IgnoreCase);MatchCollection mc = reg.Matches(model.Memo);foreach (Match m in mc){     list.Add(m.Groups["imgUrl"].Value);}