title: What is the difference between \d+ and \d- OR \w+ and \w- in regular expression terms?
body: <p>As per title, what is the difference between:</p>
  
  <p><code>\d+</code> and <code>\d-</code> 
  <code>\w+</code> and <code>\w-</code> </p>
  
  <p>in regular expression terms? What influence has <code>+</code> and <code>-</code> ?</p>