JavaScript - How to extract strings - keys/values from response using RegEx?

Question

I am very new to regex, and I want to extract some data from API responses.

I have a response from my API call:

{
  server: 'nginx/1.21.0',
  date: 'Mon, 25 Apr 2022 11:34:20 GMT',
  'content-type': 'text/html; charset=UTF-8',
  'transfer-encoding': 'chunked',
  'x-powered-by': 'PHP/7.4.16',
  expires: 'Sun, 19 Nov 1978 05:00:00 GMT',
  'cache-control': 'no-store, no-cache, must-revalidate, max-stale=0, private, post-check=0, pre-check=0',
  'x-content-type-options': 'nosniff',
  'content-security-policy': "frame-ancestors 'self';",
  'set-cookie': [
    'SSESS8b04132f4690dc8ceb7837d5134a5519=ZbgVsmpp6DBRWwNCRMm5DTpfEoKffsNM7l8ILoCWkug; path=/; domain=test.net; secure; HttpOnly',
    'su=1; expires=Thu, 22-Apr-2032 11:34:20 GMT; Max-Age=315360000; path=/; domain=test.net',
    'lt=deleted; expires=Thu, 01-Jan-1970 00:00:01 GMT; Max-Age=0; path=/; test.net',
    'dtCookie=v_4_srv_10_sn_6364C36040ADFF47B91A838BB8B2CADD_perc_100000_ol_0_mul_1_app-3Aea7c4b59f27d43eb_1; Path=/; Domain=test.net',
    '870be6fb89fc78ad2ca0eca3828e3019=7055c78f3c2b7311a5c77934caad6939; path=/; HttpOnly; Secure; SameSite=None'
  ],
  'x-oneagent-js-injection': 'true',
  'x-ruxit-js-agent': 'true',
  'server-timing': 'dtSInfo;desc="0", dtRpid;desc="493206686"',
  connection: 'close'
}

I want to extract SSESS8b04132f4690dc8ceb7837d5134a5519 & ZbgVsmpp6DBRWwNCRMm5DTpfEoKffsNM7l8ILoCWkug which are variables, and every single run that are different values.

I manage to construct a group that is capturing the whole key/value, but still when I try to console it, doesn't work.

https://regex101.com/r/2dKW4s/1

try1 as:

var matches1 = loginModern.headers.match(new RegExp("(SSESS.*)=(.+?);\s*path"));
console.log(matches1[2]);
    
result output: TypeError: loginModern.headers.match is not a function

try2:

const regex1 = new RegExp('(SSESS.*)=(.+?);\s*path');
var matches1 = regex1.exec(loginModern.headers)
console.log(matches1);

null

How to fetch SSESS8b04132f4690dc8ceb7837d5134a5519 & ZbgVsmpp6DBRWwNCRMm5DTpfEoKffsNM7l8ILoCWkug from the above response, having in mind they are changing variables?

Any help is appreciated

Answer 1

Sandbox: https://codesandbox.io/s/jwdgmp

const setCookieArray = loginModern.headers["set-cookie"];
const stringContainingSSESS = setCookieArray.find((item) =>
  item.includes("SSESS")
);

const matches = stringContainingSSESS.match(/(SSESS[a-zA-Z0-9]*)=(.+?);/);

console.log("key", matches[1]);
console.log("value", matches[2]);

I ran the regexp you provided against the loginModern.headers and it had some issues matching up. This regexp is more accurate