convert JSON with a regex [duplicate]

  {
    "Id": 46,
    "Catnaam": "salontafels",
    "ParentId": 36,
    "Overzichtsafb": null
  },
  {
    "Id": 47,
    "Catnaam": "ronde salontafels",
    "ParentId": 46,
    "Overzichtsafb": null
  },
  {
    "Id": 48,
    "Catnaam": "houten salontafels",
    "ParentId": 46,
    "Overzichtsafb": null
  },

I have JSON structure as shown above but what I want is the following:

  {
    Id: "46",
    Catnaam: "salontafels",
    ParentId: "36",
    Overzichtsafb: null
  },
  {
    Id: "47",
    Catnaam: "ronde salontafels",
    ParentId: "46",
    Overzichtsafb: null
  },
  {
    Id: "48",
    Catnaam: "houten salontafels",
    ParentId: "46",
    Overzichtsafb: null
  },

In Javascript I receive the JSON structure after calling a webmethod. There, I try to convert this JSON to what I want using a regular expression:

arr = arr.replaceAll(""([A-Za-z]*)":", "$1:");

But apparently, the regex doesn’t work, as the same JSON is returned from the regex. Does somebody have a suggestion about the regex I could use?