Regex to validate JSON

Question

I am looking for a Regex that allows me to validate json.

I am very new to Regex\'s and i know enough that parsing with Regex is bad but can it be used to validate?

Answer 1

I created a Ruby implementation of Mario's solution, which does work:

# encoding: utf-8

module Constants
  JSON_VALIDATOR_RE = /(
         # define subtypes and build up the json syntax, BNF-grammar-style
         # The {0} is a hack to simply define them as named groups here but not match on them yet
         # I added some atomic grouping to prevent catastrophic backtracking on invalid inputs
         (?  -?(?=[1-9]|0(?!\d))\d+(\.\d+)?([eE][+-]?\d+)?){0}
         (? true | false | null ){0}
         (?  " (?>[^"\\\\]* | \\\\ ["\\\\bfnrt\/] | \\\\ u [0-9a-f]{4} )* " ){0}
         (?   \[ (?> \g (?: , \g )* )? \s* \] ){0}
         (?    \s* \g \s* : \g ){0}
         (?