RegExp stumper, should be simple

RegExp stumper, should be simple

I'm usually very good with RegExp, but this one has me stumped. Here's the
javascript snippet:
var justDateRegex = '\d+/\d+/\d+';
var dateStr = $('#Dropdown').find(':selected').text();
var onlyDate = dateStr.match(justDateRegex);
console.log('Regex: ' + justDateRegex + ' dateStr: ' + dateStr + '
onlyDate: ' + onlyDate);
Here's the output from the console.log
Regex: d+/d+/d+ dateStr: 11/23/2013 12:00:00 AM onlyDate: null
I would expect the onlyDate to read: 11/23/2013, but its null. Any ideas why?