title: Find element that has text starting with/containing except full match in Imacros
body: <p>I know I can match with iMacros elements like this:</p>
  
  <pre><code>&lt;button ...&gt;Confirm action A&lt;/button&gt;
  </code></pre>
  
  <p>with</p>
  
  <pre><code>TAG POS=1 TYPE=BUTTON ATTR=TXT:Confirm&lt;SP&gt;action&lt;SP&gt;A
  </code></pre>
  
  <p>but the problem is, that sometimes I don't know <strong>exact</strong> text on the button, but I know that it will <strong>start with</strong> or <strong>contain</strong> some specific text, in that case "Confirm".</p>
  
  <p>Is it possible to match elements that contain or start with some text, instead of exact-full-text matching?</p>