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Turn a String to an array Declaration

In JS :
I have this string ="[36.79025,3.01642],[36.71477,2.99761]";
I want it to be turned To a real Array =[[36.79025,3.01642],[36.71477,2.99761]];
Is this possible?

var string = "[36.79025,3.01642],[36.71477,2.99761]";
var arr = JSON.parse(`[${string}]`);
console.log(arr);
[[36.79025,3.01642],[36.71477,2.99761]]

Loading string to array of array

I am getting a set of arrays in string format which looks like
[49,16,135],[51,16,140],[50,18,150]
Now I need to save them in an array of arrays. I tried it like
let array = [];
let str = '[49,16,135],[51,16,140],[50,18,150]';
array = str.split('[]');
console.log(array);
but it is creating only one array including all string as an element while I need to have
array = [[49,16,135],[51,16,140],[50,18,150]]

Add array delimiters to each end of the string, then use JSON.parse:
const str = '[49,16,135],[51,16,140],[50,18,150]';
const json = '[' + str + ']';
const array = JSON.parse(json);
console.log(array);

You are splitting it incorrectly, in the example, it will only split of there is a [] in the string
You can create a valid JSON syntax and parse it instead like so,
let str = '[49,16,135],[51,16,140],[50,18,150]';
let array = JSON.parse(`[${str}]`);
console.log(array);

Another way you could achieve this is by using a Function constructor. This method allows you to "loosely" pass your array.
const strArr = "[49,16,135],[51,16,140],[50,18,150]",
arr = Function(`return [${strArr}]`)();
console.log(arr);

Regex extract contents

So, I have the following data here:
{"screenName":"fubars","msgHash":"C5STUYqhjzNiP6LLVbPlTF3zYLVYXHrm","imgURL":null,"userColor":"#00a4a0","messageTime":"2:50 PM","messageDate":1442256635621,"accountType":"m","accountTypeID":"z2ZkdXqck-JO45hqXVXH","isModerator":"","badges":""
I've written some regex to extract strings, but if I search for example "screenName" it gets the "fubars" part and the rest of the string, I only want the "fubars" part...
code:
function extractSummary(iCalContent, what) {
eval("var rxm = /\""+what+"\": \"(.*)\"/g");
console.log(rxm);
setTimeout(function(){},1500);
var arr = rxm.exec(iCalContent);
return arr[1];
}

If you have some data in the form of a JSON string, you can use JSON.parse to convert it into a JSON object. You can then use dot or index property getters.
var jsonString = '{"screenName":"fubars","msgHash":"C5STUYqhjzNiP6LLVbPlTF3zYLVYXHrm"}';
var jsonObject = JSON.parse(jsonString);
console.log(jsonObject.screenName);
console.log(jsonObject['screenName']);
There's no need to use regexes here.

Parse JSON array from string

I want to convert the following string to an array
var string = '["YES","NO"]';
How do I do this?

use the global JSON.parse method
JSON.parse('["YES","NO"]'); // returns ["YES", "NO"]
You can also use the JSON.stringify method to write the array back to a string if thats how you are storing it.
JSON.stringify(["YES", "NO"]); // returns '["YES", "NO"]'

var str= '["YES","NO"]';
var replace= str.replace(/[\[\]]/g,'');
var array = replace.split(',');
Fiddle : http://jsfiddle.net/9amstq41/

You can also use $.parseJSON:
var string = '["YES","NO"]';
var array = $.parseJSON(string);

How to get from a string array?

an array of server:
Array ( [28.01.2015] => Array ( [03] => 2 [02] => 4 ) )
was converted into a string using the json_encode.
The result was a string:
{"28.01.2015":{"03":2,"02":4}}
How to use Javascript to convert this string into an array ?

You can turn that into a JavaScript object by using JSON.parse():
var my_object = JSON.parse('{"28.01.2015":{"03":2,"02":4}}');

JSON.parse('{"28.01.2015":{"03":2,"02":4}}');
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/JSON/parse

For achieve this, you need use JSON.parse.
JSON.parse('{"28.01.2015":{"03":2,"02":4}}');
Or you could organize better:
var string = '{"28.01.2015":{"03":2,"02":4}}';
var object = JSON.parse(string);