How can I search through a string a get only an specific part of it JS?

Question

I'd like to search only a specific piece of a string and show it using nothing more than JS or Jquery.

For example, (It just looks like a JSON, but it's not, it's just brackets some stuff ;) ):

var data = 
 [{"name":"node1","id":1,"is_open":true,"children":
   [
     {"name":"child2","id":3},
     {"name":"child1","id":2}
   ]
 }];

I'd like to pick up only the ID numbers:

The "code" below is not a language, it's just an example to help understanding what I'd like to do on JS/jQuery

var IDs = [searchThrough] data [where there is] "id": [getContent] after : and before , or } alert("IDs: "+IDs);

It allows me to:

1 - set a parameter of what I want from a string find "id": on data.

2 - set the start and end for getting the content after : and before , or }

How can I do it?

Thanks in advance.

"Beam me up Scotty!"

@RoryMcCrossan Thanks for pointing out :D, so how can I do it? — Kyle
– Kyle, Commented Jul 28, 2015 at 13:32
So, to clarify, you're trying to get all the id properties in the array of objects? Even those on the children? — Rory McCrossan
– Rory McCrossan, Commented Jul 28, 2015 at 13:33
kind of, I edited my question to make it clearer, sorry for not being clear — Kyle
– Kyle, Commented Jul 28, 2015 at 13:36

Varun · Accepted Answer · 2015-07-28 13:52:09Z

1

I am no regex guru,but this is my try.

var data = '[{"name":"node1","id":1,"is_open":true,"children":[{"name":"child2","id":3},{"name":"child1","id":2}]}]';
var arrays=[];
var t1=data.match(/"id":[0-9]+(,|})*/g);
for(var x=0;x<t1.length;x++)
{
  arrays.push(t1[x].match(/\d+/));   

}
alert(arrays);

answered Jul 28, 2015 at 13:52

Varun

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2 Comments

Kyle Over a year ago

I tried yours and it ran smoother, I think I'll be forced to mark yours as the answer

Varun Over a year ago

@Calne Appreciate It :) Hope it helped.

Zachary Kuhn · Accepted Answer · 2015-07-28 13:46:59Z

1

If I understand you, you want to search a String that represents the data. In this case, you could use a regular expression like the following:

var matcher = /"id":([^,\}]*/g, // capture all characters between "id" and , or }
    match, IDs = [];

while (match = matcher.exec(data)) {
  IDs.push(match[1]);
}

alert(IDs);

answered Jul 28, 2015 at 13:46

Zachary Kuhn

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1 Comment

Kyle Over a year ago

Fantastic, that was exactly what I was looking for thanks for helping me :)

Ben · Accepted Answer · 2015-07-28 13:57:09Z

1

If we take the assumption that you are dealing with a string, we can pull out the data using regular expression:

var str = '[{"name":"node1","id":1,"is_open":true,"children":\n   [\n     {"name":"child2","id":3},\n     {"name":"child1","id":2}\n   ]\n }];';
var regex = /"id":([0-9]*)/g;
var match = regex.exec(str);

var res = new Array();

while (match != null) {
  res.push(match[1]);
  match = regex.exec(str);
}

var ids = res.join();

alert("IDs: " + ids);

This demo will give you an alert box with the content "IDs: 1,3,2"

answered Jul 28, 2015 at 13:57

Ben

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