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<div>
<div id="content">
<div><div></div></div>
</div>
<div></div>
</div>
var str = document.getElementById("content");
alert(str.innerText);
(?<=<div[^>]*?id="content"[^>]*>)[^<>]*(((?'Open'<div[^>]*>)[^<>]*)+((?'-Open'</div>)[^<>]*)+)*(?(Open)(?!))(?=</div>)
protected void Page_Load(object sender, EventArgs e)
{
Response.Write(content.InnerHtml);
}