title: oracle regex replace (keep only a-z)
body: <p>I have data in <code>last_name</code> column.  </p>
  
  <p>This data comes from online and at times users are copy pasting the last name from a word document.  This is a problem when a last name has a single quote.  Somehow the single quote from a word document is weird. </p>
  
  <p>I want to write an oracle regex replace in my select query such a way that it replaces everything in the <code>last_name</code> column but just keeps (a-z or A-Z). </p>
  
  <p>Is this doable?</p>