title: REGEX a-z 0-9 but not only numbers
body: <p>Trying to match only strings 10-30 characters long with only a-z and 0-9 (but not  only numbers) in the string.  Seems to work Except when the string starts with a number then it fails.
  Not sure about the \D which should fix the not only numbers</p>
  
  <pre><code>static final Pattern UNIQUE_ID_PATTERN = Pattern.compile("^\\D[A-Za-z0-9_-]{10,30}$");
  UNIQUE_ID_PATTERN.matcher("1eeeeeeeee333e").matches(); // Does not work
  UNIQUE_ID_PATTERN.matcher("eeeeeeeee333e").matches(); // Works
  </code></pre>