title: What is the difference between ', ` and |, and when should they be used?
body: <p>I've seen strings written like in these three ways:</p>
  
  <pre><code>lv_str  = 'test'
  lv_str2 = `test`
  lv_str3 = |test|
  </code></pre>
  
  <p>The only thing I've notice so far is that ' trims whitespaces sometimes, while ` preserves them.<br>
  I just recently found | - don't know much about it yet.</p>
  
  <p>Can someone explain, or post a good link here when which of these ways is used best and if there are even more ways?</p>