title: search for all strings start with and end with c# regex
body: <p>I am trying to find all strings that start with <code>"&lt;!--Buy_"</code> and ends with <code>"_thumbnail--&gt;"</code>
   in c# regex</p>
  
  <pre><code>Regex Regex = new Regex("^&lt;!--Buy_(.*)_thumbnail--&gt;$");
  Console.WriteLine(Regex.Matches("&lt;!--Buy_blabla_thumbnail--&gt;").Count);
  </code></pre>
  
  <p>the code print zero ...
  what is the problem with my regex pattren and how to fix it ?</p>