title: Cleaning a column in a dataset R
body: <p>So I got a dataset with a column that I need to clean.
  The column has objects with stuff like: "<em>$10,000 - $19,999</em>", "<em>$40,000 and over</em>."</p>
  
  <p>How do I code this so for example "$10,000 - $19,999" becomes 15000 instead, and "<em>$40,000 and over</em>" becomes 40000 in a new column?</p>
  
  <p>I am new to R so I have no idea how to start. I need to do a regression analysis on this but it doesn't work if I don't get this fixed. </p>
  
  <p>I have been told that some basic string/regex operations are what I need. How should I proceed?</p>