title: RegEx to match M/YYYY, MM/YYYY , M/YY or MM/YY format
body: <p>Need help finding or having a RegEx match a MM/YY or MM/YYYY format.  My RegExFu is weak and I'm not even sure where to begin writing this.</p>
  
  <p>Months should be 1-12, years, well anything beyond 2009 should be valid.  Sorry for not mentioning more details before.  This is used as an expiration date.  </p>
  
  <p>I'll add a bounty for whomever goes above and beyond and validates MM/YY or MM/YYYY format that is >= today's date.  No sense letting expired stuff past the first validation layer.</p>
  
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  <p>I feel bad since I changed my requirements and had to be more specific in what I needed mid-question so I'll award bounties to all those who answered once the no-bounty window expires.</p>