C# 取出HTML中的图片地址

        ///  

        ///   取出HTML中的图片地址
        ///  

        ///   HTMLStr
        public static string GetImgUrl(string HTMLStr)
        {
            string str = string.Empty;
            Regex r = new Regex(@"]*\s*src\s*=\s*([']?)(?\S+)'?[^>]*>",
              RegexOptions.Compiled);
            Match m = r.Match(HTMLStr.ToLower());
            if (m.Success)
                str = m.Result("${url}");
            return str;
        }