.net正则表达式 获取site-item直接的内容，请问怎么写

            <div class="site-item">

              <div class="site-flag">
                <a href="/public/flag?cat=Regional%2FAsia%2FIndia%2FGujarat%2FLocalities%2FAhmedabad%2FBusiness_and_Economy%2FIndustrial%2FManufacturing&url=http%3A%2F%2Fwww.nugenindia.com"
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              <div class="site-icon"><i class='siteIcon fa fa-file-text-o'></i></div>
              <div class="title-and-desc">

                <a target="_blank" href='http://www.nugenindia.com'>
                  <div class="site-title">Nugen Machineries Ltd. </div>
                </a>

                <div class="site-descr">
                  Manufactures and exports hydraulic shears and press brakes, CNC press brakes.
                </div>

                <div class="site-url-and-ref">
                  <div class="site-url">
                    <a target="_blank" href='http://www.nugenindia.com'> http://www.nugenindia.com </a>
                  </div>

                  <div class="site-ref">
                    <a href="Regional/Asia/India/Gujarat/Localities/Ahmedabad/Business_and_Economy/Industrial/Manufacturing/"> Regional<i class='fa fa-chevron-right'></i>Asia<i class='fa fa-chevron-right'></i>India<i class='fa fa-chevron-right'></i>Gujarat<i class='fa fa-chevron-right'></i>Localities<i class='fa fa-chevron-right'></i>Ahmedabad<i class='fa fa-chevron-right'></i>Business and Economy<i class='fa fa-chevron-right'></i>Industrial<i class='fa fa-chevron-right'></i>Manufacturing </a>
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te-item">

          <div class="site-flag">
            <a href="/public/flag?cat=Regional%2FAsia%2FIndia%2FGujarat%2FLocalities%2FAhmedabad%2FBusiness_and_Economy%2FIndustrial%2FManufacturing&url=http%3A%2F%2Fwww.nugenindia.com"
               title="Report an issue with this listing"><i class='fa fa-flag'></i></a>
          </div>

          <div class="site-icon"><i class='siteIcon fa fa-file-text-o'></i></div>
          <div class="title-and-desc">

            <a target="_blank" href='http://www.nugenindia.com'>
              <div class="site-title">Nugen Machineries Ltd. </div>
            </a>

            <div class="site-descr">
              Manufactures and exports hydraulic shears and press brakes, CNC press brakes.
            </div>

            <div class="site-url-and-ref">
              <div class="site-url">
                <a target="_blank" href='http://www.nugenindia.com'> http://www.nugenindia.com </a>
              </div>

              <div class="site-ref">