title: Match byte patterns
body: <p>Say you are having a byte of pattern:</p>
  
  <p><code>byte b = 0x%1;</code></p>
  
  <p>How to tell when a byte does have certain values on the "2nd position" - in place of <code>%</code> ?
  In this example 1, no matter what the 1st position holds.</p>