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as a layperson, short American dates with four digit years work best if that's your audience. 12/1/2016


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If the digit range is not restricted (0-9) you may omit this information, this strips some complication off the sentence. What about: X, Y or Z, followed by 7 digits, followed by any letter except I, O or U. If any other rule is violated (for example spaces or special characters have been added) you could display a more specific error message.



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