Note that  . (dot) is a metacharacter | regex metacharacter (matching anything except a newline unless the  /s regex modifier is asserted, in which case it matches anything), so tybalt89's solution also identifies  '12x12y17' and  '09_30^2017' as dates.

You need to decide how dot is to be interpreted in your specifiers because another step seems to be needed (unless this is one of the downstream checks you envision).

Give a man a fish:  <%-{-{-{-<

In reply to Re: Pattern Identification by AnomalousMonk
in thread Pattern Identification by WhiteTraveller

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