^(?2)(([ \n\r\t])(((?9)(?2):((?2)(?1)(?2)))(,(?2)(?4)))?}]|\(["\/bfnrt]|u[\da-fA-F]{4}))")|-?(0|[1-9]\d)(.\d+)?([eE][-+]?\d+)?|null)(?2)$
^(?2)(([ \n\r\t])(((?9)(?2):((?2)(?1)(?2)))(,(?2)(?4)))?}]|\(["\/bfnrt]|u[\da-fA-F]{4}))")|-?(0|[1-9]\d)(.\d+)?([eE][-+]?\d+)?|null)(?2)$
@pitbuster @yogthos
When the kiddies talk about “regular expressions” these days they don’t mean it in the formal sense. They mean it in the sense of languages that evolved from regular expressions but which (badly) added features that go beyond regular languages.