Question 202192 in Javascript Question posted in
A very good W3school tutorial can be found here.

Javascript – Split a Set-Cookie header with multiple cookies

I’m working with Serverless framework (Javascript) and it requires me to split a single Set-Cookie into an array of cookies for it to be correctly set on the client. Why? No idea, but this seems to be what is going on.

I do not have access to the code that generates the Set-Cookies string, so I have to manually split it into an array.

My string looks like this:

cookie1=value, cookie2=value2; Expires=Thu, 06 Jul 2023 14:45:25 GMT;

You can probably guess my issue, if I do string.split(', ') my string is split in three:

  1. cookie1=value
  2. cookie2=value2; Expires=Thu
  3. 06 Jul 2023 14:45:25 GMT;

I’ve Googled but I cannot find an already existing answer anywhere. I know I can probably resolve this with Regex, but it’s far too complex for me to figure it out.

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2

Answers


  1. 0

    You can try this:

    let aList = [];
let s = 'cookie1=value, cookie2=value2; Expires=Thu, 06 Jul 2023 14:45:25 GMT;'
for (const match of s.matchAll(/cookied+=([^;,]+)(?:,|;)/g)) {
      console.log(`matched: ${match[1]}`);
      aList.push(match[1])
} 
console.log(aList)
//(2) ['value', 'value2']

    First part matches cookie word followed by a digit and an equal sign.
    Capture group matching one or more characters that are that are not semicolon or comma. It captures the value of cookie.

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  2. 0

    Perhaps you could first match the format using a regex, and then split on , 

    [^;,=s]+=[^;,=s]+(?:, [^;,=s]+=[^;,=s]+)+(?=;)

    The pattern matches:

    • [^;,=s]+ Match 1+ chars other than ; , = or a whitespace char
    • = Match literally
    • [^;,=s]+ Same as the first pattern
    • (?:, [^;,=s]+=[^;,=s]+)+ Repeat 1+ times , followed by the whole first pattern
    • (?=;) Positive lookahead, assert ; to the right

    Regex demo

    Or a bit broader match and and shorter pattern:

    [^=s]+=S+(?:, [^=s]+=S+)+(?=;)

    Regex demo

    const regex = /[^;,=s]+=[^;,=s]+(?:, [^;,=s]+=[^;,=s]+)+(?=;)/;
const s = `cookie1=value, cookie2=value2; Expires=Thu, 06 Jul 2023 14:45:25 GMT;`;
const m = s.match(regex);
if (m) {
  console.log(m[0].split(", "));
}
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