this post was submitted on 14 Nov 2022
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A Regex which accepts valid JSON and rejects invalid JSON (twitter.com)
submitted 2 years ago by yogthos@lemmy.ml to c/programming@lemmy.ml
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^(?2)({([ \n\r\t])(((?9)(?2):((?2)(?1)(?2)))(,(?2)(?4)))?}|[(?2)((?1)(?2)(,(?5)))?]|true|false|("([^"\\p{Cc}]|\(["\/bfnrt]|u[\da-fA-F]{4}))")|-?(0|[1-9]\d*)(.\d+)?([eE][-+]?\d+)?|null)(?2)$

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[–] pitbuster@lemmy.ml 1 points 2 years ago (1 children)

JSON is not a regular language, so you can't parse it using regex: https://cstheory.stackexchange.com/questions/3987/is-json-a-regular-language

[–] qqmrichter@mastodon.world 1 points 2 years ago

@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.

[–] robohack@lemmy.ca 1 points 2 years ago

A small set of regular expressions can tokenize JSON text -- that's what lex helps with, for example. However regular expressions cannot truly parse anything.