C#HTML与UBB（纯文本）之间的转换

private string HtmlToUBB(string _Html)

        {

           _Html = Regex.Replace(_Html,"<br[^>]*>","\n");

           _Html = Regex.Replace(_Html,@"<p[^>\/]*\/>","\n");

           _Html = Regex.Replace(_Html,"\\son[\\w]{3,16}\\s?=\\s*([\'\"]).+?\\1", "");

           _Html = Regex.Replace(_Html,"<hr[^>]*>","[hr]");

           _Html = Regex.Replace(_Html,"<(\\/)?blockquote([^>]*)>","[$1blockquote]");

           _Html = Regex.Replace(_Html,"<img[^>]*smile=\"(\\d+)\"[^>]*>","'[s:$1]");

           _Html = Regex.Replace(_Html,"<img[^>]*src=[\'\"\\s]*([^\\s\'\"]+)[^>]*>","");

           _Html = Regex.Replace(_Html,"<a[^>]*href=[\'\"\\s]*([^\\s\'\"]*)[^>]*>(.+?)<\\/a>","[url=$1]$2[/url]");

           _Html = Regex.Replace(_Html,"<b>(.+?)</b>",@"\[b\]$1\[/b\]");

           _Html = Regex.Replace(_Html,"<[^>]*?>", "");

           _Html = Regex.Replace(_Html,"&amp;", "&");

           _Html = Regex.Replace(_Html,"&nbsp;", " ");

           _Html = Regex.Replace(_Html,"&lt;", "<");

           _Html = Regex.Replace(_Html,"&gt;", ">");

           return _Html;

        }

        public string UBBToHtml(stringcontent)  //ubb转html

        {

           content = Regex.Replace(content, @"\r\n","<br/>");

           content = Regex.Replace(content, " ","&nbsp;");

           content = Regex.Replace(content,@"\[b\](.+?)\[/b\]","<b>$1</b>");

           content = Regex.Replace(content,@"\[i\](.+?)\[/i\]","<i>$1</i>");

           content = Regex.Replace(content,@"\[u\](.+?)\[/u\]","<u>$1</u>");

           content = Regex.Replace(content,@"\[p\](.+?)\[/p\]", "<pclass='load'>$1</p>");

           content = Regex.Replace(content,@"\[align=left\](.+?)\[/align\]","<align='left'>$1</align>");

           content = Regex.Replace(content,@"\[align=center\](.+?)\[/align\]","<align='center'>$1</align>");

           content = Regex.Replace(content,@"\[align=right\](.+?)\[/align\]","<align='right'>$1</align>");

           content = Regex.Replace(content,@"\[url=(?<url>.+?)]\[/url]","<a href='${url}'target=_blank>${url}</a>");

           content = Regex.Replace(content,@"\[url=(?<url>.+?)](?<name>.+?)\[/url]","<a href='${url}'target=_blank>${name}</a>");

           content = Regex.Replace(content,@"\[quote](?<text>.+?)\[/quote]","<divclass=quote>${text}</div>");

           content = Regex.Replace(content,@"\[img](?<img>.+?)\[/img]","<img src='${img}' alt=''/>");

           return content;

        }