RegExp \d Bug

I have the following RegExp validating a text box for a date.

"ValidateRegularExpression"=>"2\d\d\d-([1-9]|0[1-9]|1[012])-([1-9]|0[1-9]|[12][0-9]|3[01])",
"ValidateRegularExpressionErrorMessage"=>"Enter a valid date (yyyy-mm-dd)."

It works with the javascript, but then it fails on the server side.

I think it is a problem with \d because the following works on both javascript and on the server side: "2[0-9]{3}-([1-9]|0[1-9]|1[012])-([1-9]|0[1-9]|[12][0-9]|3[01])"

Nevermind, I read your previous post about POSIX regular expressions.

That is not really a bug of the class, but rather about differences of implementation between PHP POSIX and Javascript regular expressions.

In POSIX it should be [:digit:] and Javascript should be \d . Since neither work on both sides, it is recommended that you stick to [0-9] .