title: Ruby string with USD "money" converted to number
body: <p>Is there currently a gem that's capable of taking strings, all in USD for this purpose, and converting them to a number? Some examples would be:</p>
  
  <ul>
  <li>"$7,600" would turn into 7600</li>
  <li>"5500" would turn into 5500</li>
  </ul>
  
  <p>I know on the "5500" example I can just do "5500".to_i, but the spreadsheets being imported aren't consistent and some include commas and dollar signs while others do not. There a decent way of handling this across the board in Ruby?</p>
  
  <p>I've tried something like <code>money_string.scan(/\d/).join</code> which seems to be fine, just worried I'll run into edge cases I haven't found yet, such as decimal places.</p>