title: Ruby regex "contains a word"
body: <p>In Ruby, how can I write a regex to inspect a submission for a single word?</p>
  
  <p>Imagine I have a web form that that accepts text.  I know if I want to see if the sentence --only-- contains "join" I can use </p>
  
  <pre><code>    if the_body == "join"
  </code></pre>
  
  <p>But that only works if the entire text submission is "join".</p>
  
  <p>How do I catch a submission like this:</p>
  
  <p>"I want to join your club?" or 
  "Join me please"</p>
  
  <p>Thanks!</p>