title: Regex match exact words
body: <p>I want my regex to match <code>?ver</code> and <code>?v</code>, but <strong>not</strong> <code>?version</code></p>
  
  <p>This is what I have so far: <code>$parts = preg_split( "(\b\?ver\b|\b\?v\b)", $src );</code> </p>
  
  <p>I think the trouble might be how I escape the <code>?</code>.</p>