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Regular expression crossword puzzle

No one can solve this. Not Ken Jennings. Not Marilyn vos Savant. Not Alan Turing. Not Ada Lovelace. Not Watson. Not even Richard Feynman. (Ok, maybe Feynman.)

Regexp Crossword

(via @lhl)

Update: Here’s the answer to the puzzle, presumably by some time traveling super-being from the future. (via @grimmelm)