Parsing out data from a string using regEx?

Question

I'm reading through a bunch of random "Header" information in node.

It looks something like this:

_Aa:GA1.1.78037747.867108, 44907=5xyz; Webstorm-a36041d5=9fbb-48e9-b19e-e3f0a3282151; srce=coolernode; nsid=1234; cookie_data=T%3D1; _gat_PP=1;

Problem: I'm trying to write a regEx or something to parse out "cookie_data" value from the string.

Is it possible to convert it to a map or extract cookie_data=T%3D1?

I've tried doing:

const i= str.indexOf('cookie_data');
const res = str.chatAt(i);

But still going nowhere, since I can't keep traversing until i get ';'

Wondering to see if there's any other effective way to extract info?

You want T%3D1?

Marcos Casagrande
– Marcos Casagrande

2018-04-19 02:21:58 +00:00
Commented Apr 19, 2018 at 2:21 — Marcos Casagrande
– Marcos Casagrande, Commented Apr 19, 2018 at 2:21
@MarcosCasagrande yes

TechnoCorner
– TechnoCorner

2018-04-19 02:22:45 +00:00
Commented Apr 19, 2018 at 2:22 — TechnoCorner
– TechnoCorner, Commented Apr 19, 2018 at 2:22

CertainPerformance · Accepted Answer · 2018-04-19 02:23:02Z

3

Use match to match the text found between two parts of a string:

const str = '_Aa:GA1.1.78037747.867108, 44907=5xyz; Webstorm-a36041d5=9fbb-48e9-b19e-e3f0a3282151; srce=coolernode; nsid=1234; cookie_data=T%3D1; _gat_PP=1;'
const found = str.match(/cookie_data=([^;]+);/)[1];
console.log(found);

Or you can split by semicolons and make an object representing the string, and access the appropriate property:

const str = '_Aa:GA1.1.78037747.867108, 44907=5xyz; Webstorm-a36041d5=9fbb-48e9-b19e-e3f0a3282151; srce=coolernode; nsid=1234; cookie_data=T%3D1; _gat_PP=1;'
const splits = str.split('; ');
const obj = splits.reduce((obj, substr) => {
  if (!substr.includes('=')) return obj;
  const [key, value] = substr.split('=');
  obj[key] = value;
  return obj;
}, {});
console.log(obj);
console.log(obj.cookie_data);

answered Apr 19, 2018 at 2:23

CertainPerformance

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1 Comment

RobG Over a year ago

The second approach should be preferred as the OP would end up with a parser that provides a general solution for other cases. However, the _Aa:GA1.1.78037747.867108, part seems to need different parse rules to the rest of the string.

Marcos Casagrande · Accepted Answer · 2018-04-19 02:38:41Z

You can use cookie package to parse the cookie and you will get all the other values too, not only cookie_data

const cookie = require('cookie');

const string = '_Aa:GA1.1.78037747.867108, 44907=5xyz; Webstorm-a36041d5=9fbb-48e9-b19e-e3f0a3282151; srce=coolernode; nsid=1234; cookie_data=T%3D1; _gat_PP=1$

const parsed = cookie.parse(string);

console.log(parsed.cookie_data); // T=1 (decoded)
/*
   { '_Aa:GA1.1.78037747.867108, 44907': '5xyz',
   'Webstorm-a36041d5': '9fbb-48e9-b19e-e3f0a3282151',
   srce: 'coolernode',
   nsid: '1234',
   cookie_data: 'T=1',
   _gat_PP: '1' }
*/

or since you were trying a regex, use match with a capture group to get the value of cookie_data, and decodeURIComponent to decode the value and get T=1 instead of T%3D1

const string = '_Aa:GA1.1.78037747.867108, 44907=5xyz; Webstorm-a36041d5=9fbb-48e9-b19e-e3f0a3282151; srce=coolernode; nsid=1234; cookie_data=T%3D1; _gat_PP=1;'
const [,data] = string.match(/cookie_data=(.+?);/);
console.log(data, decodeURIComponent(data));

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