title: Change text in regex to upper-case
body: <p>I have a problem. How can I change text between "&lt;" and ">" (HTML tags), to upper-case letters?
  Part of code:</p>
  
  <pre><code>string a= @"&lt;html&gt;&lt;b&gt;hello world!&lt;/b&gt;
  &lt;table&gt;test&lt;/table&gt;&lt;/html&gt;";
  a = Regex.Replace(a, @"&lt;(.|\n)*?&gt;", String.Empty);
  </code></pre>
  
  <p>Now, output is:</p>
  
  <pre><code>hello world!
  test
  </code></pre>
  
  <p>And I want to have:</p>
  
  <pre><code>&lt;HTML&gt;&lt;B&gt;hello world!&lt;/B&gt;
  &lt;TABLE&gt;test&lt;/TABLE&gt;&lt;/HTML&gt;
  </code></pre>
  
  <p>I know that String.Empty delete code between &lt; >, but how to change this text to upper-case letters? Just give me some advice, how to do it.</p>
  
  <p>Greetings!</p>