title: Java regex error
body: <p>Whenever I enter the following...</p>
  
  <pre><code>Pattern pmessage = Pattern.compile("\s*\p{Alnum}[\p{Alnum}\s]*");
  Matcher mmessage = pmessage.matcher(message);
  Matcher msubject = pmessage.matcher(subject);
  </code></pre>
  
  <p>I get a <code>Invalid Escape Sequence</code> error. Anyone have any idea why / how I fix this?</p>