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var str = @"<div class='test1'><input type='hidden' id='_hid'/></div>
<div class='test2'></div>
<div class='test3'></div>";
var filterStr = "test1";
var result = Regex.Replace(str, string.Format(@"<div[^>]*class='{0}'>.*[{1}].*</div>", filterStr, filterStr), "");