UBB代码对于经常上论坛的朋友来说是最熟悉不过了。这里我不多说了，关于怎么实现UBB转换，不了解的朋友请看这里正则表达式在ＵＢＢ论坛中的应用。

经典论坛的UBB转换我觉得是处理的非常好的，研究了一下它的转换结果[因为没有源码:)]，做了下面的演示。转换结果基本上觉得象了。

主要是针对[code]{html}这两个标签的处理，其他的UBB标签还是一般的处理方法。

下面是分别用javascript和vbscript实现的演示。自己做论坛的朋友，如果想实现类似经典论坛的运行代码框可以看看这种转换。

欢迎大家输入尽量多格式的UBB进行测试，多多指出错误。
javascirpt:
复制代码 代码如下:

<style>
.CodeSamp {
PADDING-RIGHT: 0.5em; MARGIN-TOP: 1em; PADDING-LEFT: 0.5em; FONT-SIZE: 8p; MARGIN-BOTTOM: 1em; PADDING-BOTTOM: 0.5em; MARGIN-LEFT: 0pt; PADDING-TOP: 0.5em; FONT-FAMILY: "Courier New"; BACKGROUND-COLOR: #eeeeee;width: 480px;overflow:hidden;border: 1px solid #888888;
}
textarea {
border-width: 1; border-color: #000000;font-size: 12px;FONT-FAMILY: "Tahoma", "MS Shell Dlg";
}
</style>

<TEXTAREA name=phx cols=65 rows=12>
[i][b][color=blue]blue[/color][/b][/i]

{html}[color=red]te
st[/color]{/html}

{html}[code]te
st[/code]{/html}

[code]{html}te
st{/html}[/code]</textarea>
<br><button onclick=show.innerHTML=UBBCode(phx.value,"html")>转换</button><br>
<div id=show style="border:1 solid skyblue;width=500;font-size: 12px;FONT-FAMILY:
'Tahoma', 'MS Shell Dlg';
"></div>

<script>
strIcons = "1" //允许笑脸转换
strSmile="1" //同上
ImgName="em"
picurl="pic/"

function UBBCode(content,html){
st=new Date().getTime()
content=content.replace(/\[(\/)?phx_code\]/ig,"{$1phx_code}");
content=content.replace(/\[(\/)?phx_html\]/ig,"{$1phx_html}");
content="[phx_code]"+content+"[/phx_code]";
content=content.replace(/(\[code\]([\s\S]+?)\[\/code\])/ig,"[/phx_code]$1[phx_code]");
content=content.replace(/\[phx_code\]([\s\S]*?)\[\/phx_code\]/ig,function($1,$2){if(html=="html"){return(HTMLCode($2));}else{return(trans($2));}});
content=content.replace(/\[code\](\r\n)?([\s\S]+?)\[\/code\]/ig,function($1,$2,$3){return("<PRE class=CodeSamp>"+DvbbsHtmlAn($3)+"</PRE>")});
content=content.replace(/\{(\/)?phx_code\}/ig,"[$1phx_code]");
content=content.replace(/\{(\/)?phx_html\}/ig,"[$1phx_html]");
alert('共耗时 '+eval(new Date().getTime()-st)+' ms');
return(content);
}

function HTMLCode(content){
content="[phx_html]"+content+"[/phx_html]";
content=content.replace(/(\[html\]([\s\S]+?)\[\/html\])/ig,"[/phx_html]$1[phx_html]");
content=content.replace(/\[phx_html\]([\s\S]*?)\[\/phx_html\]/ig,function($1,$2){return(trans($2))});
content=content.replace(/\[html\]([\s\S]+?)\[\/html\]/ig,function($1,$2){return("<span><TEXTAREA cols=95 rows=12>"+hencode($2)+"</TEXTAREA><br><INPUT onclick=runCode() type=button value=运行代码>[Ctrl+A 全部选择 提示：你可先修改部分代码，再按运行]</span>")});
return(content);
}

function hencode(fString){ //简单模拟server.htmlencode ASP中不用这个
fString = fString.replace(/&/ig,"&amp;")
fString = fString.replace(/>/ig,"&gt;")//>
fString = fString.replace(/</ig,"&lt;")//<
return fString;
}

function DvbbsHtmlAn(fString){

if(fString=="")return("");

fString=hencode(fString)

fString = fString.replace(/\t/ig,"&nbsp;&nbsp;&nbsp;")//Tab
fString = fString.replace(/"/ig,"&quot;")//"
fString = fString.replace(/'/ig,"&#39;")//'
fString = fString.replace(/\r/ig,"")//回车是一个13+10
fString = fString.replace(/\n\n/ig,"<P>")//
fString = fString.replace(/\n/ig,"<BR>")//换行
fString = fString.replace(/\x20/ig,"&nbsp;")//空格

return(fString);
}

function trans(strContent){
var re;
strContent=DvbbsHtmlAn(strContent);

re=/\[IMG\](.+?)\[\/IMG\]/ig;
strContent=strContent.replace(re,"<a href=$1 target=_blank><IMG SRC=$1 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\" galleryImg=no></a>");
re=/\[DIR=*([0-9]*),*([0-9]*)\](.*?)\[\/DIR]/ig
strContent=strContent.replace(re,"<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:///go/getflashplayer' type='application/x-shockwave-flash' width=$2 height=$3>$4</embed></OBJECT>")

re.Pattern="(\[UPLOAD=gif\])(.*?)(\[\/UPLOAD\])"
strContent= re.Replace(strContent,"<br><IMG SRC="""&picurl&"gif.gif"" border=0>此主题相关图片如下：<br><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>")
re.Pattern="(\[UPLOAD=jpg\])(.*?)(\[\/UPLOAD\])"
strContent= re.Replace(strContent,"<br><IMG SRC="""&picurl&"jpg.gif"" border=0>此主题相关图片如下：<br><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>")
re.Pattern="(\[UPLOAD=bmp\])(.*?)(\[\/UPLOAD\])"
strContent= re.Replace(strContent,"<br><IMG SRC="""&picurl&"bmp.gif"" border=0>此主题相关图片如下：<br><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>")

re.Pattern="(\[UPLOAD=(.[^\[]*)\])(.*?)(\[\/UPLOAD\])"
strContent= re.Replace(strContent,"<br><IMG SRC="""&picurl&"$2.gif"" border=0> <a href=""$3"">点击浏览该文件</a>")

re.Pattern="(\[URL\])(.*?)(\[\/URL\])"
strContent= re.Replace(strContent,"<A HREF=""$2"" TARGET=_blank>$2</A>")
re.Pattern="(\[URL=(.[^\[]*)\])(.*?)(\[\/URL\])"
strContent= re.Replace(strContent,"<A HREF=""$2"" TARGET=_blank>$3</A>")

re.Pattern="(\[EMAIL\])(.*?)(\[\/EMAIL\])"
strContent= re.Replace(strContent,"<img align=absmiddle src=pic/email1.gif><A HREF=""mailto:$2"">$2</A>")
re.Pattern="(\[EMAIL=(.[^\[]*)\])(.*?)(\[\/EMAIL\])"
strContent= re.Replace(strContent,"<img align=absmiddle src=pic/email1.gif><A HREF=""mailto:$2"" TARGET=_blank>$3</A>")

re.Pattern = "^(http://[A-Za-z0-9\./=\?%\-&_~`@':+!]+)"
strContent = re.Replace(strContent,"<img align=absmiddle src=pic/url.gif><a target=_blank href=$1>$1</a>")
re.Pattern = "(http://[A-Za-z0-9\./=\?%\-&_~`@':+!]+)$"
strContent = re.Replace(strContent,"<img align=absmiddle src=pic/url.gif><a target=_blank href=$1>$1</a>")
re.Pattern = "(<BR>|<P>)(http://[A-Za-z0-9\./=\?%\-&_~`@':+!]+)(<BR>|<P>)"
strContent = re.Replace(strContent,"$1<img align=absmiddle src=pic/url.gif><a target=_blank href=$2>$2</a>$3")
re.Pattern = "^(ftp://[A-Za-z0-9\./=\?%\-&_~`@':+!]+)"
strContent = re.Replace(strContent,"<img align=absmiddle src=pic/url.gif><a target=_blank href=$1>$1</a>")
re.Pattern = "(ftp://[A-Za-z0-9\./=\?%\-&_~`@':+!]+)$"
strContent = re.Replace(strContent,"<img align=absmiddle src=pic/url.gif><a target=_blank href=$1>$1</a>")
re.Pattern = "[^>=""](ftp://[A-Za-z0-9\.\/=\?%\-&_~`@':+!]+)"
strContent = re.Replace(strContent,"<img align=absmiddle src=pic/url.gif><a target=_blank href=$1>$1</a>")
re.Pattern = "^(rtsp://[A-Za-z0-9\./=\?%\-&_~`@':+!]+)"
strContent = re.Replace(strContent,"<img align=absmiddle src=pic/url.gif><a target=_blank href=$1>$1</a>")
re.Pattern = "(rtsp://[A-Za-z0-9\./=\?%\-&_~`@':+!]+)$"
strContent = re.Replace(strContent,"<img align=absmiddle src=pic/url.gif><a target=_blank href=$1>$1</a>")
re.Pattern = "[^>=""](rtsp://[A-Za-z0-9\.\/=\?%\-&_~`@':+!]+)"
strContent = re.Replace(strContent,"<img align=absmiddle src=pic/url.gif><a target=_blank href=$1>$1</a>")
re.Pattern = "^(mms://[A-Za-z0-9\./=\?%\-&_~`@':+!]+)"
strContent = re.Replace(strContent,"<img align=absmiddle src=pic/url.gif><a target=_blank href=$1>$1</a>")
re.Pattern = "(mms://[A-Za-z0-9\./=\?%\-&_~`@':+!]+)$"
strContent = re.Replace(strContent,"<img align=absmiddle src=pic/url.gif><a target=_blank href=$1>$1</a>")
re.Pattern = "[^>=""](mms://[A-Za-z0-9\.\/=\?%\-&_~`@':+!]+)"
strContent = re.Replace(strContent,"<img align=absmiddle src=pic/url.gif><a target=_blank href=$1>$1</a>")

if strIcons = "1" then '笑脸转换
re.Pattern="(\["&ImgName&"(.*?)\])"
strContent=re.Replace(strContent,"<img src="&picurl&ImgName&"$2.gif border=0 align=middle>")
end if

if strSmile = "1" then '笑脸转换
re.Pattern="(\[s(\d{1,2})\])"
strContent=re.Replace(strContent,"<img src=smile/face$2.gif border=0 align=middle>")
end if

re.Pattern="(\[color=(.[^\[]*)\])(.*?)(\[\/color\])"
strContent=re.Replace(strContent,"<font color=$2 style=""font-size:"&FontSize&"pt;line-height:"&FontHeight&"pt"">$3</font>")
re.Pattern="(\[face=(.[^\[]*)\])(.*?)(\[\/face\])"
strContent=re.Replace(strContent,"<font face=$2 style=""font-size:"&FontSize&"pt;line-height:"&FontHeight&"pt"">$3</font>")
re.Pattern="(\[align=(.[^\[]*)\])(.*?)(\[\/align\])"
strContent=re.Replace(strContent,"<div align=$2>$3</div>")
'循环转换quote
re.Pattern="(\[QUOTE\])(.*?)(\[\/QUOTE\])"
while (instr(strContent,"[quote]")>0 and instr(strContent,"[/quote]")>0)
strContent=re.Replace(strContent,"<blockquote>引用:<hr><span>$2</span><hr></blockquote>")
wend
re.Pattern="(\[fly\])(.*?)(\[\/fly\])"
strContent=re.Replace(strContent,"<marquee width=90% behavior=alternate scrollamount=3>$2</marquee>")
re.Pattern="(\[move\])(.*?)(\[\/move\])"
strContent=re.Replace(strContent,"<MARQUEE scrollamount=3>$2</marquee>")
re.Pattern="\[GLOW=*([0-9]*),*(#*[a-z0-9]*),*([0-9]*)\](.*?)\[\/GLOW]"
strContent=re.Replace(strContent,"<table width=$1 style=""filter:glow(color=$2, strength=$3)"">$4</table>")
re.Pattern="\[SHADOW=*([0-9]*),*(#*[a-z0-9]*),*([0-9]*)\](.*?)\[\/SHADOW]"
strContent=re.Replace(strContent,"<table width=$1 style=""filter:shadow(color=$2, strength=$3)"">$4</table>")

re.Pattern="(\[i\])(.*?)(\[\/i\])"
strContent=re.Replace(strContent,"<i>$2</i>")
re.Pattern="(\[u\])(.*?)(\[\/u\])"
strContent=re.Replace(strContent,"<u>$2</u>")
re.Pattern="(\[b\])(.*?)(\[\/b\])"
strContent=re.Replace(strContent,"<b>$2</b>")

re.Pattern="(\[size=1\])(.*?)(\[\/size\])"
strContent=re.Replace(strContent,"<font size=1 style=""line-height:"&FontHeight&"pt"">$2</font>")
re.Pattern="(\[size=2\])(.*?)(\[\/size\])"
strContent=re.Replace(strContent,"<font size=2 style=""line-height:"&FontHeight&"pt"">$2</font>")
re.Pattern="(\[size=3\])(.*?)(\[\/size\])"
strContent=re.Replace(strContent,"<font size=5 style=""line-height:"&FontHeight&"pt"">$2</font>")
re.Pattern="(\[size=4\])(.*?)(\[\/size\])"
strContent=re.Replace(strContent,"<font size=6 style=""line-height:"&FontHeight&"pt"">$2</font>")

re.Pattern="\[size=([+|-]?[0-7])\](.*?)(\[\/size\])"
strContent=re.Replace(strContent,"<font size=$1 style=""line-height:"&FontHeight&"pt"">$2</font>")

re.Pattern="(\[center\])(.*?)(\[\/center\])"
strContent=re.Replace(strContent,"<center>$2</center>")

re.Pattern="(\[table=(#*[a-z0-9]*),(#*[a-z0-9]*),(#*[a-z0-9]*)\])(.*?)(\[\/table\])"
strContent=re.Replace(strContent,"<table border=0 cellpadding=5 cellspacing=1 bgcolor=$2><tr><td bgcolor=$3><font color=$4>$5</font></td></tr></table>")

'{HTML} start
're.Pattern="(\[html\])(.*?)(\[\/html\])"
'strContent=re.Replace(strContent,"<span><TEXTAREA cols=95 rows=12>$2</TEXTAREA><br><INPUT onclick=runCode() type=button value=运行代码>[Ctrl+A 全部选择 提示：你可先修改部分代码，再按运行]</span>")

'{/HTML}end

set re=Nothing
gmt=strContent
end function

</script>