Parse javascript function from json string

parse.js

if (typeof String.prototype.parseFunction != 'function') {
    String.prototype.parseFunction = function () {
        var funcReg = /function *\(([^()]*)\)[ \n\t]*{(.*)}/gmi;
        var match = funcReg.exec(this.replace(/\n/g, ' '));

        if(match) {
            return new Function(match[1].split(','), match[2]);
        }

        return null;
    };
}


function parseToFunction(t, func) {
  switch (t?.constructor) {
    case Object:
      return Object.fromEntries(
        Object.entries(t).map(([k,v]) =>
          [k, func([k, parseToFunction(v, func)])]
        )
      )
    case Array:
      return t.map((v, k) => func([k, parseToFunction(v, func)]))
    default:
      return func([null, t])
  }
}

var data = {
    "processing": true,
    "serverSide": true,
    "serverMethod": "post",
    "ajax": {
        "url": "data",
        "cache": false,
        "callback": "function(arg){console.log(arg)}"
    },
    "others": [
        {"anoher_callback": "function(arg){console.log(arg)}"},
        {"something": "function(arg){console.log(arg)}"}
    ]
};

console.log(parseToFunction(data, ([k,v]) =>
  (typeof v === 'string' && v.slice(0, 8) == "function") ? v.parseFunction() : v
))

parsing js objects literals.