How to get first instance to last instance of a number in a string in javascript regex/ object error?

Question

I have a string "{\"id\":\"35112914\"}" obtained after JSON.stringify . I want just the number 35112914 or the first instance of a number ,i.e. 3 to the last ,i.e., 4 . Is there any other way of approaching this ?

Edit: I had to stringify because of a weird error I was getting. While accessing the property of the object, i was getting undefined as the answer , which made the number inaccessible. Stringify atleast shows up the number .

Edit 2 :

My code is written in node which makes curl request to a REST api .

curl.request(optionsRun, function (error, response) {
                console.log(response);
                setTimeout(function () {
                    ID = response ;
                    console.log(ID["id"]) ;
                },2000) ;
            }) ;

Output:

{"id":"35113281"}
undefined

or parse the string: `JSON.parse('{\"id\":\"35112914\"}').id` — Denys Séguret, Jun 04 '15 at 14:06
Might be worth posting the code that was giving the "weird error". If it's stringify-able, it's got to be readable on its own. That's how stringification *happens*. — Paul Roub, Jun 04 '15 at 14:08
"no proper solution for that error was available" - if that were true, `stringify` would have failed. There's a mistake, or a bad assumption, somewhere along the way. You can find ways to sort-of work around it, or you can correct it. — Paul Roub, Jun 04 '15 at 14:09
Are you modifying the response ? It looks like you're trying to build a bad workaround for this problem: http://stackoverflow.com/questions/23667086/why-is-my-variable-unaltered-after-i-modify-it-inside-of-a-function-asynchron — Denys Séguret, Jun 04 '15 at 14:14
What happens if you say `console.log(typeof response))` in addition to `console.log(response)`? — Paul Roub, Jun 04 '15 at 14:15
Nope, Why would I ? lol . setTimeout is for safety purposes because of a separate function . — saruftw, Jun 04 '15 at 14:15
You're also not parsing the response so obviously `console.log(ID["id"])` will return `undefined`. — Andy, Jun 04 '15 at 14:16
I'd work on accomplishing whatever is clashing with another function in a promise. — Klors, Jun 04 '15 at 14:16
That's what I suspected. @Andy is right - you don't have an object. `response` is a JSON string. If you say `ID = JSON.parse(response);`, all should be well. — Paul Roub, Jun 04 '15 at 14:17

score 4 · Accepted Answer · answered Jun 04 '15 at 14:23

4

You need to parse your response to a JS object before you can access it using JS object methods:

curl.request(optionsRun, function (error, response) {
  var ID = JSON.parse(response);
  setTimeout(function () {
    console.log(ID.id) ;
  }, 2000);
});

DEMO

answered Jun 04 '15 at 14:23

Andy

61,948
13
68
95

3

Thanks for making `ID` local. That was troubling. – Paul Roub Jun 04 '15 at 14:24
Yeah, had it in the demo, just forgot to carry it across to here :) – Andy Jun 04 '15 at 14:25
OP may have declared ID outside of the curl request? Which would still be worrying... – Klors Jun 04 '15 at 14:25
1

Then OP is free to re-globalize it. But starting out safely makes for a better example. – Paul Roub Jun 04 '15 at 14:27
I need to keep it global . I am using it in other methods . – saruftw Jun 04 '15 at 14:27

score 0 · Answer 2 · answered Jun 04 '15 at 14:09

0

this regexp will give you any numbers combination between two quotes /\"(\d+)\"/

answered Jun 04 '15 at 14:09

Katya Pavlenko

3,303
3
16
28

1

The OP has an error in his code that sound like it's easily fixable so you might find this answer is a little premature. – Andy Jun 04 '15 at 14:12

How to get first instance to last instance of a number in a string in javascript regex/ object error?

2 Answers2