js正则匹配table tr

<textarea id="txt"> 
<table border=1 width="20%">           
        <tr><th>title</th><th>title2</th></tr> 
           <tr rs="{id:\'section006\'}"><td>data1</td><td>data2      </td> 
           </tr> 
           <tr ><td>data1</td><td>data2</td></tr> 
</table> 
</textarea> 
<script> 
var str = document.getElementById('txt').value; 
alert(str); 
</script>