title: Regular Expression to describe Credit Card expiry (valid thru) date
body: <p>I need a regular expression to validate credit card expiry date. Note that the format of the "date" is MM/YY where YY is the year without century and MM is the month (from 01 to 12). I do not need the YY to be in some limited range but only the MM. 
  Thank you in advance.</p>