title: PhpUnit Assert if string contains on numeric characters
body: <p>Just wondering on how to test if a string contains on numeric characters.</p>
  
  <p>I tried</p>
  
  <pre><code>$testdata = [           
     'ver'  =&gt; '087'
  ];
  
  $this-&gt;assertRegExp('/0-9/',$testdata['ver']);
  </code></pre>
  
  <p>but the above fails.</p>