title: cakePHP "required" validation
body: <p>is there any mistake in this validation???</p>
  
  <pre><code> var $validate = array(
    'brand_id' =&gt; array(
     'required' =&gt; array(true),
     'message' =&gt; array('select a brand'),
    )
      );
  </code></pre>
  
  <p>brand_id is a select box<br>
  It show error as "message" instead of "select a brand"<br>
  if the message is not in array it shows error</p>
  
  <pre><code>Warning (2): preg_match() [function.preg-match]: Delimiter must not be alphanumeric or backslash [CORE\cake\libs\model\model.php, line 2571]
  </code></pre>
  
  <p>using cakePHP 1.3</p>