title: How to use flowVars inside wildcard filter and expression filter Mule
body: <p>Is it possible to use the flowVariable inside wildcard or  expression filter directly.
  I need to stop the flow based on the flow Variable value.</p>
  
  <p>Example: My flow Variable name <code>keyValue</code> have the value like <code>customer/feed/h26/h56</code> in this  'h26/h56' should set dynamically but <code>customer/feed</code> is constant always. I need to set my filter only after '/feed/' if it contain any characters. </p>
  
  <pre><code>  &lt;flow name="testFlow1" doc:name="testFlow1"&gt;
      &lt;file:inbound-endpoint responseTimeout="10000" doc:name="File" path="c:/in"/&gt;
       .......( Many component)
      &lt;set-variable variableName="keyValue" value="#[customer/feed/h26/h56]" doc:name="Variable"/&gt;
       .......( Many component)    
       &lt;message-filter doc:name="Message"&gt;
          &lt;wildcard-filter pattern="customer/feed/+*" caseSensitive="true"/&gt;
      &lt;/message-filter&gt;
  &lt;/flow&gt;
  </code></pre>
  
  <p>Used <code>+</code> in pattern to check whether it contain one or more characters.</p>
  
  <p>Also I used expression filter, not sure how to use flow Variable inside the filter expression.  Could you please help me on this.</p>
  
  <p>I don't want to use property filter.</p>