title: What does this regex means?
body: <p>I find this java regex, but don't understand what does it match? </p>
  
  <p><code>Pattern.compile("\\p{javaJavaIdentifierStart}\\p{javaJavaIdentifierPart}*(\\.\\p{javaJavaIdentifierStart}\\p{javaJavaIdentifierPart}*)*");</code></p>
  
  <p>What <code>javaJavaIdentifierStart</code> matches?</p>