title: Regex for matching a set of words
body: <p>Is there a way to match a set of words in a sentence?</p>
  
  <p>The requirement is I would like to check whether a sentence contains the following words <code>po</code> or <code>p.o</code> or <code>p.o</code>  or <code>box</code>. But it shouldn't catch post or sandbox.</p>
  
  <p>po --> error</p>
  
  <p>post --> success</p>
  
  <p>box --> error</p>
  
  <p>hippo --> succes</p>
  
  <p>Thanks in advance</p>