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/(?=\d{4}-\d\d-\d\d)             # Date format
 (?=.{8}(?:0[1-9]|[12]\d|3[01])) # Day 01-31
...
 (?![13579][048]00-02-29)        # -"-
 (?![02468][26]00-02-29)         # -"-
/x