title: How to search files in google drive using apps script based on custom keyword with regex?
body: <p>I have script to search file in google drive with apps script based on keyword.</p>
  <p>e.g. I want to search file that contains &quot;FX.ABCDEF&quot;.</p>
  <p>I using <strong>fullText contains {text}</strong>.</p>
  <p>Here the code :</p>
  <pre><code>var searchFiles = DriveApp.searchFiles('fullText contains &quot;FX.ABCDEF&quot; ')
  </code></pre>
  <p>On the other hand many keywords are similar to <strong>FX.ABCDEF</strong>. Characters after <strong>FX.</strong> is dynamic. Therefore I don't want to define keywords like that over and over again. So in cases like this a simplification is needed using <strong>regex</strong>.
  So we can write :</p>
  <pre><code>/FX\.[A-Z]+/g
  </code></pre>
  <p>I'm still confused about implementing <strong>regex</strong> in <strong>searchFiles</strong>.</p>