I have a html document's source in a textbox.. how can i search for "<table width="640" border="0" cellspacing="0" cellpadding="0" height="10">" and put all data between the starting "<table..." to the second "</table>" in another textbox?

for example in the textbox with the source theres..

<body>
lots of junk here
<table width="640" border="0" cellspacing="0" cellpadding="0" height="10"><tr></tr></table>
<table>
stuff inside the table
</table>
more junk here

and then after running the program, the second textbox will contain
<table width="640" border="0" cellspacing="0" cellpadding="0" height="10"><tr></tr></table>
<table>
stuff inside the table
</table>


anyone know how to do this?