title: Jenkins build when multiple files are found
body: <p>Is it possible to trigger a build with <a href="https://wiki.jenkins-ci.org/display/JENKINS/Files+Found+Trigger" rel="nofollow noreferrer">Files Found Trigger Plugin</a> when multiple files are found in a certain directory? </p>
  
  <p>For example:</p>
  
  <p><a href="https://i.stack.imgur.com/TMam3.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/TMam3.png" alt="enter image description here"></a></p>
  
  <p>The setting above is what I configured with Files Found Trigger.</p>
  
  <p>The build is triggered when any one of the files (e.g. <code>a.txt</code> or <code>b.txt</code>) I specified exists. This is not the case I want.</p>
  
  <p>How can I trigger the build only when both <code>a.txt</code> and <code>b.txt</code> exist? </p>