UBB转HTML

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/// <summary>
        /// 转全角的函数(SBC case)
        /// </summary>
        /// <param name="input">任意字符串</param>
        /// <returns>全角字符串</returns>
        /// <remarks>
        /// 全角空格为12288，半角空格为32
        /// 其他字符半角(33-126)与全角(65281-65374)的对应关系是：均相差65248
        /// </remarks>
        public static string ConvertToSBC(string input)
        {
            //半角转全角：
            char[] c = input.ToCharArray();
            for (int i = 0; i < c.Length; i++)
            {
                if (c[i] == 32)
                {
                    c[i] = (char)12288;
                    continue;
                }
                if (c[i] < 127)
                {
                    c[i] = (char)(c[i] + 65248);
                }
            }
            return new string(c);
        }

        /// <summary>
        /// 转半角的函数(DBC case)
        /// </summary>
        /// <param name="input">任意字符串</param>
        /// <returns>半角字符串</returns>
        /// <remarks>
        /// 全角空格为12288，半角空格为32
        /// 其他字符半角(33-126)与全角(65281-65374)的对应关系是：均相差65248
        /// </remarks>
        public static string ConvertToDBC(string input)
        {
            char[] c = input.ToCharArray();
            for (int i = 0; i < c.Length; i++)
            {
                if (c[i] == 12288)
                {
                    c[i] = (char)32;
                    continue;
                }
                if (c[i] > 65280 && c[i] < 65375)
                {
                    c[i] = (char)(c[i] - 65248);
                }
            }
            return new string(c);
        }

/// <summary>
        /// UBB转HTML
        /// </summary>
        /// <param name="s"></param>
        /// <returns></returns>
        public static string UbbToHtml(string s)
        {
            s = HtmlFilter(s);
            s = s.Replace(" ", "&nbsp;");//空格
            s = s.Replace("\n", "<br/>");//回车
            Regex reg = new Regex(@"(\[IMG\])(.[^\[]*)(\[\/IMG\])", RegexOptions.IgnoreCase);
            s = reg.Replace(s, @"<a href=""$2"" target=_blank><IMG SRC=""$2"" border=0 alt=按此在新窗口浏览图片 onload=""javascript:if(this.width>screen.width-333)this.width=screen.width-333""></a>");

            reg = new Regex(@"\[DIR=*([0-9]*),*([0-9]*)\](.[^\[]*)\[\/DIR]", RegexOptions.IgnoreCase);
            s = reg.Replace(s, @"<object classid=clsid:166B1BCA-3F9C-11CF-8075-444553540000 codebase=http://download.macromedia.com/pub/shockwave/cabs/director/sw.cab#version=7,0,2,0 width=$1 height=$2><param name=src value=$3><embed src=$3 pluginspage=http://www.macromedia.com/shockwave/download/ width=$1 height=$2></embed></object>");

            reg = new Regex(@"\[QT=*([0-9]*),*([0-9]*)\](.[^\[]*)\[\/QT]", RegexOptions.IgnoreCase);
            s = reg.Replace(s, @"<embed src=$3 width=$1 height=$2 autoplay=true loop=false controller=true playeveryframe=false cache=false scale=TOFIT bgcolor=#000000 kioskmode=false targetcache=false pluginspage=http://www.apple.com/quicktime/>");

            reg = new Regex(@"\[MP=*([0-9]*),*([0-9]*)\](.[^\[]*)\[\/MP]", RegexOptions.IgnoreCase);
            s = reg.Replace(s, @"<object align=middle classid=CLSID:22d6f312-b0f6-11d0-94ab-0080c74c7e95 class=OBJECT id=MediaPlayer width=$1 height=$2 ><param name=ShowStatusBar value=-1><param name=Filename value=$3><embed type=application/x-oleobject codebase=http://activex.microsoft.com/activex/controls/mplayer/en/nsmp2inf.cab#Version=5,1,52,701 flename=mp src=$3  width=$1 height=$2></embed></object>");

            reg = new Regex(@"\[RM=*([0-9]*),*([0-9]*)\](.[^\[]*)\[\/RM]", RegexOptions.IgnoreCase);
            s = reg.Replace(s, @"<OBJECT classid=clsid:CFCDAA03-8BE4-11cf-B84B-0020AFBBCCFA class=OBJECT id=RAOCX width=$1 height=$2><PARAM NAME=SRC VALUE=$3><PARAM NAME=CONSOLE VALUE=Clip1><PARAM NAME=CONTROLS VALUE=imagewindow><PARAM NAME=AUTOSTART VALUE=true></OBJECT><br><OBJECT classid=CLSID:CFCDAA03-8BE4-11CF-B84B-0020AFBBCCFA height=32 id=video2 width=$1><PARAM NAME=SRC VALUE=$3><PARAM NAME=AUTOSTART VALUE=-1><PARAM NAME=CONTROLS VALUE=controlpanel><PARAM NAME=CONSOLE VALUE=Clip1></OBJECT>");

            reg = new Regex(@"(\[FLASH\])(.[^\[]*)(\[\/FLASH\])", RegexOptions.IgnoreCase);
            s = reg.Replace(s, @"<OBJECT codeBase=http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab#version=4,0,2,0 classid=clsid:D27CDB6E-AE6D-11cf-96B8-444553540000 width=500 height=400><PARAM NAME=movie VALUE=""$2""><PARAM NAME=quality VALUE=high><embed src=""$2"" quality=high pluginspage='http://www.macromedia.com/shockwave/download/index.cgi?P1_Prod_Version=ShockwaveFlash' type='application/x-shockwave-flash' width=500 height=400>$2</embed></OBJECT>");

            reg = new Regex(@"(\[ZIP\])(.[^\[]*)(\[\/ZIP\])", RegexOptions.IgnoreCase);
            s = reg.Replace(s, @"<br><IMG SRC=pic/zip.gif border=0> <a href=""$2"">点击下载该文件</a>");

            reg = new Regex(@"(\[RAR\])(.[^\[]*)(\[\/RAR\])", RegexOptions.IgnoreCase);
            s = reg.Replace(s, @"<br><IMG SRC=pic/rar.gif border=0> <a href=""$2"">点击下载该文件</a>");

            reg = new Regex(@"(\[UPLOAD=(.[^\[]*)\])(.[^\[]*)(\[\/UPLOAD\])", RegexOptions.IgnoreCase);
            s = reg.Replace(s, @"<br><IMG SRC=""pic/$2.gif"" border=0>此主题相关图片如下：<br><A HREF=""$3"" TARGET=_blank><IMG SRC=""$3"" border=0 alt=按此在新窗口浏览图片 onload=""javascript:if(this.width>screen.width-333)this.width=screen.width-333""></A>");

            reg = new Regex(@"(\[URL\])(http:\/\/.[^\[]*)(\[\/URL\])", RegexOptions.IgnoreCase);
            s = reg.Replace(s, @"<A HREF=""$2"" TARGET=_blank>$2</A>");

            reg = new Regex(@"(\[URL\])(.[^\[]*)(\[\/URL\])", RegexOptions.IgnoreCase);
            s = reg.Replace(s, @"<A HREF=""http://$2"" TARGET=_blank>$2</A>");

            reg = new Regex(@"(\[URL=(http:\/\/.[^\[]*)\])(.[^\[]*)(\[\/URL\])", RegexOptions.IgnoreCase);
            s = reg.Replace(s, @"<A HREF=""$2"" TARGET=_blank>$3</A>");

            reg = new Regex(@"(\[URL=(.[^\[]*)\])(.[^\[]*)(\[\/URL\])", RegexOptions.IgnoreCase);
            s = reg.Replace(s, @"<A HREF=""http://$2"" TARGET=_blank>$3</A>");

            reg = new Regex(@"(\[EMAIL\])(\S+\@.[^\[]*)(\[\/EMAIL\])", RegexOptions.IgnoreCase);
            s = reg.Replace(s, @"<A HREF=""mailto:$2"">$2</A>");

            reg = new Regex(@"(\[EMAIL=(\S+\@.[^\[]*)\])(.[^\[]*)(\[\/EMAIL\])", RegexOptions.IgnoreCase);
            s = reg.Replace(s, @"<A HREF=""mailto:$2"" TARGET=_blank>$3</A>");

            reg = new Regex(@"^(HTTP://[A-Za-z0-9\./=\?%\-&_~`@':+!]+)", RegexOptions.IgnoreCase);
            s = reg.Replace(s, @"<a target=_blank href=$1>$1</a>");

            reg = new Regex(@"(HTTP://[A-Za-z0-9\./=\?%\-&_~`@':+!]+)$", RegexOptions.IgnoreCase);
            s = reg.Replace(s, @"<a target=_blank href=$1>$1</a>");

            reg = new Regex(@"[^>=""](HTTP://[A-Za-z0-9\./=\?%\-&_~`@':+!]+)", RegexOptions.IgnoreCase);
            s = reg.Replace(s, @"<a target=_blank href=$1>$1</a>");

            reg = new Regex(@"^(FTP://[A-Za-z0-9\./=\?%\-&_~`@':+!]+)", RegexOptions.IgnoreCase);
            s = reg.Replace(s, @"<a target=_blank href=$1>$1</a>");

            reg = new Regex(@"(FTP://[A-Za-z0-9\./=\?%\-&_~`@':+!]+)$", RegexOptions.IgnoreCase);
            s = reg.Replace(s, @"<a target=_blank href=$1>$1</a>");

            reg = new Regex(@"[^>=""](FTP://[A-Za-z0-9\.\/=\?%\-&_~`@':+!]+)", RegexOptions.IgnoreCase);
            s = reg.Replace(s, @"<a target=_blank href=$1>$1</a>");

            reg = new Regex(@"^(RTSP://[A-Za-z0-9\./=\?%\-&_~`@':+!]+)", RegexOptions.IgnoreCase);
            s = reg.Replace(s, @"<a target=_blank href=$1>$1</a>");

            reg = new Regex(@"(RTSP://[A-Za-z0-9\./=\?%\-&_~`@':+!]+)$", RegexOptions.IgnoreCase);
            s = reg.Replace(s, @"<a target=_blank href=$1>$1</a>");

            reg = new Regex(@"[^>=""](RTSP://[A-Za-z0-9\.\/=\?%\-&_~`@':+!]+)", RegexOptions.IgnoreCase);
            s = reg.Replace(s, @"<a target=_blank href=$1>$1</a>");

            reg = new Regex(@"^(MMS://[A-Za-z0-9\./=\?%\-&_~`@':+!]+)", RegexOptions.IgnoreCase);
            s = reg.Replace(s, @"<a target=_blank href=$1>$1</a>");
            reg = new Regex(@"(MMS://[A-Za-z0-9\./=\?%\-&_~`@':+!]+)$", RegexOptions.IgnoreCase);
            s = reg.Replace(s, @"<a target=_blank href=$1>$1</a>");

            reg = new Regex(@"[^>=""](MMS://[A-Za-z0-9\.\/=\?%\-&_~`@':+!]+)", RegexOptions.IgnoreCase);
            s = reg.Replace(s, @"<a target=_blank href=$1>$1</a>");

            reg = new Regex(@"(\[HTML\])(.[^\[]*)(\[\/HTML\])", RegexOptions.IgnoreCase);
            s = reg.Replace(s, @"<table width='100%' border='0' cellspacing='0' cellpadding='6' bgcolor=''><td><b>以下内容为程序代码:</b><br>$2</td></table>");

            reg = new Regex(@"(\[CODE\])(.[^\[]*)(\[\/CODE\])", RegexOptions.IgnoreCase);
            s = reg.Replace(s, @"<table width='100%' border='0' cellspacing='0' cellpadding='6' bgcolor=''><td><b>以下内容为程序代码:</b><br>$2</td></table>");

            reg = new Regex(@"(\[COLOR=(.[^\[]*)\])(.[^\[]*)(\[\/COLOR\])", RegexOptions.IgnoreCase);
            s = reg.Replace(s, @"<font COLOR=$2>$3</font>");

            reg = new Regex(@"(\[FACE=(.[^\[]*)\])(.[^\[]*)(\[\/FACE\])", RegexOptions.IgnoreCase);
            s = reg.Replace(s, @"<font FACE=$2>$3</font>");

            reg = new Regex(@"(\[ALIGN=(.[^\[]*)\])(.*)(\[\/ALIGN\])", RegexOptions.IgnoreCase);
            s = reg.Replace(s, @"<div ALIGN=$2>$3</div>");

            reg = new Regex(@"(\[QUOTE\])(.*)(\[\/QUOTE\])", RegexOptions.IgnoreCase);
            s = reg.Replace(s, @"<table cellpadding=0 cellspacing=0 border=0 WIDTH=94% bgcolor=#000000 align=center><tr><td><table width=100% cellpadding=5 cellspacing=1 border=0><TR><TD BGCOLOR=''>$2</table></table><br>");

            reg = new Regex(@"(\[MOVE\])(.*)(\[\/MOVE\])", RegexOptions.IgnoreCase);
            s = reg.Replace(s, @"<MARQUEE scrollamount=3>$2</marquee>");

            reg = new Regex(@"\[GLOW=*([0-9]*),*(#*[a-z0-9]*),*([0-9]*)\](.[^\[]*)\[\/GLOW]", RegexOptions.IgnoreCase);
            s = reg.Replace(s, @"<table width=$1 style=""filter:glow(color=$2, strength=$3)"">$4</table>");

            reg = new Regex(@"\[SHADOW=*([0-9]*),*(#*[a-z0-9]*),*([0-9]*)\](.[^\[]*)\[\/SHADOW]", RegexOptions.IgnoreCase);
            s = reg.Replace(s, @"<table width=$1 style=""filter:shadow(color=$2, strength=$3)"">$4</table>");

            reg = new Regex(@"(\[I\])(.[^\[]*)(\[\/I\])", RegexOptions.IgnoreCase);
            s = reg.Replace(s, @"<i>$2</i>");

            reg = new Regex(@"(\[B\])(.[^\[]*)(\[\/U\])", RegexOptions.IgnoreCase);
            s = reg.Replace(s, @"<u>$2</u>");

            reg = new Regex(@"(\[B\])(.[^\[]*)(\[\/B\])", RegexOptions.IgnoreCase);
            s = reg.Replace(s, @"<b>$2</b>");

            reg = new Regex(@"(\[FLY\])(.[^\[]*)(\[\/FLY\])", RegexOptions.IgnoreCase);
            s = reg.Replace(s, @"<marquee onmouseover='this.stop();' onmouseout='this.start();'>$2</marquee>");

            reg = new Regex(@"(\[SIZE=1\])(.[^\[]*)(\[\/SIZE\])", RegexOptions.IgnoreCase);
            s = reg.Replace(s, @"<font size=1>$2</font>");

            reg = new Regex(@"(\[SIZE=2\])(.[^\[]*)(\[\/SIZE\])", RegexOptions.IgnoreCase);
            s = reg.Replace(s, @"<font size=2>$2</font>");

            reg = new Regex(@"(\[SIZE=3\])(.[^\[]*)(\[\/SIZE\])", RegexOptions.IgnoreCase);
            s = reg.Replace(s, @"<font size=3>$2</font>");

            reg = new Regex(@"(\[SIZE=4\])(.[^\[]*)(\[\/SIZE\])", RegexOptions.IgnoreCase);
            s = reg.Replace(s, @"<font size=4>$2</font>");

            reg = new Regex(@"(\[CENTER\])(.[^\[]*)(\[\/CENTER\])", RegexOptions.IgnoreCase);
            s = reg.Replace(s, @"<center>$2</center>");
            return s;
        }

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原文地址：https://www.cnblogs.com/Googler/p/1959165.html

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