title: Using Regex convert dd/mm/yy into dd/mm/yyyy
body: <p>I'm using Regex and I want to convert <code>dd/mm/yy</code> into full <code>dd/mm/yyyy</code>.</p>
  
  <p>For example. User enters his date of birth: <code>01/11/94</code><br/>
  The program converts the year <code>94</code> into <code>1994</code>.</p>
  
  <p>Now if the user inserts date of birth: <code>01/11/09</code><br/>
  The program converts the year <code>09</code> to <code>01/11/2009</code> because it can't be <code>1909</code>. Unless you a vampire.</p>
  
  <p>And now if the user inserts the date of birth: <code>01/11/15</code> <br/>
  The program let's the user to continue to type because its the current year. <code>2015</code>. Incorporation of current date validity check function here would be necessary.</p>
  
  <p>I have come this far but I need help making it fully functional.
  If you'd like to help, I can show you somewhat of the code I've created.</p>