this expression will do the trick:
(0[1-9]|1[012])[/](0[1-9]|[12][0-9]|3[01])[/](\d{4})
but, be aware, that this forces 2 digit month and days so you should probably apply a JavaScript mask to the date field on your webform so that the user is aware of this.
"The one language all programmers understand is profanity."
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