论坛系统的各种过滤

Web.config
<add key="badword" value="去死吧" /><!--过虑字符，请用“|”号隔开-->

public string rebadword(string chr)
  {
   string[] array=badword.Split(new char[]{'|'});
   for(int i=0;i<=array.Length-1;i+=1)
   {
    chr=chr.Replace(array.GetValue(i).ToString(),"**");
   }
   return(chr);
  }

<add key="isubb" value="1" /><!--是否使用UBB代码，1为使用，0为不使用-->
<add key="isflash" value="1" /><!--/是否支持FLASH-->
<add key="isimg" value="1" /><!--是否支持图片-->

if( isubb == 1)
   {
    chr = Regex.Replace(chr,@"\[url=(?<x>[^\]]*)\](?<y>[^\]]*)\[/url\]",@"<a href=$1 target=_blank>$2</a>",RegexOptions.IgnoreCase);
    chr = Regex.Replace(chr,@"\[url\](?<x>[^\]]*)\[/url\]",@"<a href=$1 target=_blank>$1</a>",RegexOptions.IgnoreCase);

    chr = Regex.Replace(chr,@"\[email=(?<x>[^\]]*)\](?<y>[^\]]*)\[/email\]",@"<a href=$1>$2</a>",RegexOptions.IgnoreCase);
    chr = Regex.Replace(chr,@"\[email\](?<x>[^\]]*)\[/email\]",@"<a href=$1>$1</a>",RegexOptions.IgnoreCase);

    if(isflash==1)
    {
     chr = Regex.Replace(chr,@"\[flash](?<x>[^\]]*)\[/flash]",@"<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=""$1""><PARAM NAME=quality VALUE=high><embed src=""$1"" quality=high pluginspage='http://www.macromedia.com/shockwave/download/index.cgi?P1_Prod_Version=ShockwaveFlash' type='application/x-shockwave-flash' width=500 height=400>$1</embed></OBJECT>",RegexOptions.IgnoreCase);
    }
    if(isimg==1)
    {
     chr = Regex.Replace(chr,@"\[img](?<x>[^\]]*)\[/img]",@"<IMG SRC=""$1"" border=0>",RegexOptions.IgnoreCase);
    }
    chr = Regex.Replace(chr,@"\[color=(?<x>[^\]]*)\](?<y>[^\]]*)\[/color\]",@"<font color=$1>$2</font>",RegexOptions.IgnoreCase);
    chr = Regex.Replace(chr,@"\[face=(?<x>[^\]]*)\](?<y>[^\]]*)\[/face\]",@"<font face=$1>$2</font>",RegexOptions.IgnoreCase);

    chr = Regex.Replace(chr,@"\[size=1\](?<x>[^\]]*)\[/size\]",@"<font size=1>$1</font>",RegexOptions.IgnoreCase);
    chr = Regex.Replace(chr,@"\[size=2\](?<x>[^\]]*)\[/size\]",@"<font size=2>$1</font>",RegexOptions.IgnoreCase);
    chr = Regex.Replace(chr,@"\[size=3\](?<x>[^\]]*)\[/size\]",@"<font size=3>$1</font>",RegexOptions.IgnoreCase);
    chr = Regex.Replace(chr,@"\[size=4\](?<x>[^\]]*)\[/size\]",@"<font size=4>$1</font>",RegexOptions.IgnoreCase);

    chr = Regex.Replace(chr,@"\[align=(?<x>[^\]]*)\](?<y>[^\]]*)\[/align\]",@"<align=$1>$2</align>",RegexOptions.IgnoreCase);

    chr = Regex.Replace(chr,@"\[fly](?<x>[^\]]*)\[/fly]",@"<marquee width=90% behavior=alternate scrollamount=3>$1</marquee>",RegexOptions.IgnoreCase);
    chr = Regex.Replace(chr,@"\[move](?<x>[^\]]*)\[/move]",@"<marquee scrollamount=3>$1</marquee>",RegexOptions.IgnoreCase);

    chr = Regex.Replace(chr,@"\[glow=(?<x>[^\]]*),(?<y>[^\]]*),(?<z>[^\]]*)\](?<w>[^\]]*)\[/glow\]",@"<table width=$1 style='filter:glow(color=$2, strength=$3)'>$4</table>",RegexOptions.IgnoreCase);
    chr = Regex.Replace(chr,@"\[shadow=(?<x>[^\]]*),(?<y>[^\]]*),(?<z>[^\]]*)\](?<w>[^\]]*)\[/shadow\]",@"<table width=$1 style='filter:shadow(color=$2, strength=$3)'>$4</table>",RegexOptions.IgnoreCase);

    chr = Regex.Replace(chr,@"\[b\](?<x>[^\]]*)\[/b\]",@"<b>$1</b>",RegexOptions.IgnoreCase);
    chr = Regex.Replace(chr,@"\[i\](?<x>[^\]]*)\[/i\]",@"<i>$1</i>",RegexOptions.IgnoreCase);
    chr = Regex.Replace(chr,@"\[u\](?<x>[^\]]*)\[/u\]",@"<u>$1</u>",RegexOptions.IgnoreCase);
    chr = Regex.Replace(chr,@"\[code\](?<x>[^\]]*)\[/code\]",@"<pre id=code><font size=1 face='Verdana, Arial' id=code>$1</font id=code></pre id=code>",RegexOptions.IgnoreCase);

    chr = Regex.Replace(chr,@"\[list\](?<x>[^\]]*)\[/list\]",@"<ul>$1</ul>",RegexOptions.IgnoreCase);
    chr = Regex.Replace(chr,@"\[list=1\](?<x>[^\]]*)\[/list\]",@"<ol type=1>$1</ol id=1>",RegexOptions.IgnoreCase);
    chr = Regex.Replace(chr,@"\[list=a\](?<x>[^\]]*)\[/list\]",@"<ol type=a>$1</ol id=a>",RegexOptions.IgnoreCase);
    chr = Regex.Replace(chr,@"\[\*\](?<x>[^\]]*)\[/\*\]",@"<li>$1</li>",RegexOptions.IgnoreCase);
    chr = Regex.Replace(chr,@"\[quote](?<x>.*)\[/quote]",@"<center>—— 以下是引用 ——<table border='1' width='80%' cellpadding='10' cellspacing='0' ><tr><td>$1</td></tr></table></center>",RegexOptions.IgnoreCase);
   }
   return(chr);
  }

<add key="ishtml" value="0" /><!--是否支持html-->

if(ishtml==0)
   {
    chr=chr.Replace("<","&lt");
    chr=chr.Replace(">","&gt");
    chr=chr.Replace("\n","<br>");
   }