title: Removing everything in a string before a specific phrase and after a specific phrase
body: <p>I have a string and I want to delete everything before a phrase, and then delete everything after a different phrase.  i.e.,</p>
  
  <pre><code>myString = "words words words FIRSTPHRASE these words I want SECONDPHRASE but not these words"
  </code></pre>
  
  <p>So the new string would be <code>"these words I want"</code>.</p>