title: How to remove all characters from a string before a specific character
body: <p>Suppose I have a string <code>A</code>, for example:</p>
  
  <pre><code>string A = "Hello_World";
  </code></pre>
  
  <p>I want to remove all characters up to (and including) the <code>_</code>. The exact number of characters before the <code>_</code> may vary. In the above example, <code>A == "World"</code> after removal.</p>