title: Vim remove part of line in a file
body: <p>I have a big file contains many lines in the following format,</p>
  
  <pre><code>&lt;SomeString1&gt;Key1&lt;/SomeString&gt;
  &lt;SomeString2&gt;Key2&lt;/SomeString&gt;
  &lt;SomeString3&gt;Key3&lt;/SomeString&gt;
  ...
  </code></pre>
  
  <p>I want to remove the tags, and the output should look like,</p>
  
  <pre><code> Key1
   Key2
   Key3
   ...
  </code></pre>
  
  <p>Algorithmically, I should write something like:</p>
  
  <pre><code>For all lines:
     Remove all string before character `&gt;`
     Remove all string after character `&lt;/`
  </code></pre>