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Regular Expression Date Validation

 
 
Paul Keister
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      10-07-2003
I'm currently using the following regular expression for U.S. date
validation:

\d{1,2}/\d{1,2}/\d{4}| \d{1,2}/\d{1,2}/\d{2}

I could have used

\d{1,2}/\d{1,2}/\d{2,4}

but that would allow the case of a three digit year (I wouldn't sleep at
night!).

My question is this: Why is it that when I use the inverse pattern, e.g.

\d{1,2}/\d{1,2}/\d{2}| \d{1,2}/\d{1,2}/\d{4}

that four digit date strings fail validation? I have a feeling this has
something to do with regex evaluation rules, but I can't quite puzzle it
out.

Just curious,

Paul Keister
PJPM
www.pjpm.biz


 
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