I only find how to validate it as 3 distinct fields:

...
 { date  => ['year',  'month', 'day'] } => ['DATE'],
...

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But now I want to validate them as a whole(stored in a single <input type="text" name="date" />) in the format xxxx-xx-xx, how to do that?

In reply to How do I validate DATE as a single field with FormValidator::Simple? by PerlOnTheWay

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