title: Search string for content
body: <p>I seem to be missing basic string operations in Google script.</p>
  
  <p>How can I search for stringA in stringB ?</p>
  
  <p>I'm searching the Description field, in an array of files (doclist.find) for specific keywords.</p>
  
  <p>Maybe there is another way of doing this, I've tried to use regexp or underscoregs._find but hav'nt made it work.</p>
  
  <p>Thank you</p>