正则表达式难题！解决思路

正则表达式难题！！！
如何获取一段html中包含特定字符的某个标签对！

如：
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN ">
<HTML>
<HEAD>
<TITLE> New Document </TITLE>
<META NAME= "Generator " CONTENT= "EditPlus ">
<META NAME= "Author " CONTENT= " ">
<META NAME= "Keywords " CONTENT= " ">
<META NAME= "Description " CONTENT= " ">
</HEAD>

<BODY>
<TABLE>
<TR>
<TD> asdf </TD>
<TD> asdf </TD>
</TR>
<TR>
<TD> #asdf </TD>
<TD> asdf </TD>
</TR>
<TR>
<TD> sdf </TD>
<TD> asdf </TD>
</TR>
<TR>
<TD> sdf </TD>
<TD> asdf </TD>
</TR>
</TABLE>
</BODY>
</HTML>

我要获取
<TR>
<TD> #asdf </TD>
<TD> asdf </TD>
</TR>

[解决办法]

HTML code

&lt;!DOCTYPE   HTML   PUBLIC   "-//W3C//DTD   HTML   4.0   Transitional//EN "&gt; &lt;HTML&gt;   &lt;HEAD&gt;     &lt;TITLE&gt;   New   Document   &lt;/TITLE&gt;     &lt;META   NAME= "Generator "   CONTENT= "EditPlus "&gt;     &lt;META   NAME= "Author "   CONTENT= " "&gt;     &lt;META   NAME= "Keywords "   CONTENT= " "&gt;     &lt;META   NAME= "Description "   CONTENT= " "&gt;   &lt;/HEAD&gt;   &lt;BODY&gt;     &lt;TABLE&gt;     &lt;TR&gt; &lt;TD&gt; asdf &lt;/TD&gt; &lt;TD&gt; asdf &lt;/TD&gt;     &lt;/TR&gt;     &lt;TR&gt; &lt;TD&gt; #asdf &lt;/TD&gt; &lt;TD&gt; asdf &lt;/TD&gt;     &lt;/TR&gt;     &lt;TR&gt; &lt;TD&gt; sdf &lt;/TD&gt; &lt;TD&gt; asdf &lt;/TD&gt;     &lt;/TR&gt;     &lt;TR&gt; &lt;TD&gt; sdf &lt;/TD&gt; &lt;TD&gt; asdf &lt;/TD&gt;     &lt;/TR&gt;     &lt;/TABLE&gt;   &lt;/BODY&gt; &lt;/HTML&gt; &lt;script&gt;window.onload=function(){    var obj=document.body;    alert(obj.innerHTML.match(/&lt;tr(?![^#]+&lt;\/tr&gt;)[#\s\S]*?&lt;\/tr&gt;/gim));}&lt;/script&gt;

正则表达式难题！解决思路

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