title: Remove varying substring (semester name) from given string
body: <p>I have a database of courses that are formatted with the course title and semester.</p>
  
  <p>Some examples:</p>
  
  <ul>
  <li>ARCH 6359 Spring 2015</li>
  <li>BIOL 3324 Fall 2013</li>
  <li>ENGI 2304 SP15</li>
  <li>GCSW FA 13</li>
  <li>GENB 4350 Summer 2011</li>
  <li>GROUP Writing Consultations 2011Fall</li>
  <li>YES Prep Fa12 </li>
  </ul>
  
  <p>(fa-fall sp-spring)</p>
  
  <p>I need make a copy and remove the semester from each of these strings. The inconsistencies in format are causing me a huge headache. </p>
  
  <p>Any input on how to start this task would be greatly appreciated.</p>