Need regex for proper date

I have this expression in a  <asp:RegularExpressionValidator control
(0[1-9]|1[012])[- /.](0[1-9]|[12][0-9]|3[01])[- /.](19|20)\d\d

It has a problem with the date. It will allow any day in any month up to the 31.  Is there a regex for a "Valid Date" format  I need it in mm/dd/yyyy format.

Leap year would be super great to catch

Charles BaldoSoftware DeveloperAsked:
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HonorGodSoftware EngineerCommented:
It is much safer to have a simple RegExp (like the one you have), and then use the match to create a date object.  This date object can be formatted to match the input, and then these 2 values can be compared.

Please check the regular expression on the link below created by Dany Lauener.

MM/dd/yyyy with 100% leap years. Valid since year 1900. MM and DD could have 1 or 2 digits : M/d/yyyy or MM/d/yyyy or M/dd/yyyy

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Charles BaldoSoftware DeveloperAuthor Commented:
I used ideas from both the regex validated a date nice. With a proper format date I could format without fear of it being a bad date.  Thanks Both
HonorGodSoftware EngineerCommented:
Thanks for the assist, and the points.

Good luck & have a great day.
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Regular Expressions

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