正则表达式

            //匹配图片
            var regexImg = new Regex(@"<img (.*?)src=(.[^[^>]*)(.*?)>", RegexOptions.IgnoreCase);
            var matches = regexImg.Matches(editor1.BodyHtml);
            var ftp = Common.NewsFtp(true);
            //遍历每个图片
            foreach (Match match in matches)
            {
                string localPath = match.Value;
                //匹配地址
                var regex = new Regex("src="(.*)">");
                var matchLocal = regex.Match(localPath);
                if (matchLocal.Success)
                {
                    string str = matchLocal.Groups[1].Value;
                    if (File.Exists(str))
                    {
                        var fileInfo = new FileInfo(str);
                        string dir = Path.GetDirectoryName(str);
                        string ext = Path.GetExtension(str);
                        string path = dir + "\" + Guid.NewGuid() + ext;
                        fileInfo.MoveTo(path);
                        try
                        {
                            ftp.UploadFile(path, "");
                            string s = BasePath.ContentImagesAbsoluteURI +
                                       Path.GetFileName(path);
                            string detail = t.NewsDetail;
                            detail = detail.Replace(str, s);
                            t.NewsDetail = detail;
                        }
                        catch (Exception ex)
                        {
                            MessageBox.Show(ex.Message);
                            return;
                        }
                    }
                }
            }