gistfile1.rb

r = Regexp.compile(<<'__REGEXP__'.strip, Regexp::EXTENDED)
(?<json> \g<object> | \g<array> ){0}
(?<begin-array>  \g<ws> \[ \g<ws> ){0}
(?<begin-object> \g<ws> \{ \g<ws> ){0}
(?<end-array>    \g<ws> \] \g<ws> ){0}
(?<end-object>   \g<ws> \} \g<ws> ){0}
(?<name-separator>  \g<ws> : \g<ws> ){0}
(?<value-separator> \g<ws> , \g<ws> ){0}
(?<ws> [\x20\t\n\r]* ){0}
(?<value>  false | null | true | \g<object> | \g<array> | \g<number> | \g<string> ){0}
(?<object> \g<begin-object> (?: \g<member> (?: \g<value-separator> \g<member> )* )? \g<end-object> ){0}
(?<member> \g<string> \g<name-separator> \g<value> ){0}
(?<array> \g<begin-array> (?: \g<value> (?: \g<value-separator> \g<value> )* )? \g<end-array> ){0}
(?<number> \-? \g<int> \g<frac>? \g<exp>? ){0}
(?<exp> [eE] [-+] [0-9]+ ){0}
(?<frac> \. [0-9]+ ){0}
(?<int> 0 | [1-9] [0-9]* ){0}
(?<string> " \g<char>* " ){0}
(?<char> [^\x00-\x1F"\\] | \\ (?: ["\\\/\b\f\n\r\t] | u [0-9a-fA-F]{4} ) ){0}
\A\g<json>\z
__REGEXP__

j1 = <<'__JSON__'
   {
      "Image": {
          "Width":  800,
          "Height": 600,
          "Title":  "View from 15th Floor",
          "Thumbnail": {
              "Url":    "http://www.example.com/image/481989943",
              "Height": 125,
              "Width":  "100"
          },
          "IDs": [116, 943, 234, 38793]
        }
   }
__JSON__

j2 = <<'__JSON__'
   [
      {
         "precision": "zip",
         "Latitude":  37.7668,
         "Longitude": -122.3959,
         "Address":   "",
         "City":      "SAN FRANCISCO",
         "State":     "CA",
         "Zip":       "94107",
         "Country":   "US"
      },
      {
         "precision": "zip",
         "Latitude":  37.371991,
         "Longitude": -122.026020,
         "Address":   "",
         "City":      "SUNNYVALE",
         "State":     "CA",
         "Zip":       "94085",
         "Country":   "US"
      }
   ]
__JSON__