I am having some trouble with Regex. Basically what I want to do is take any either of these types of spotify urls for a playlist

or

spotify:user:spotify:playlist:37i9dQZF1DZ06evO2ZpGiQ

And get the user id which would be spotify for these URLs and would like to get the playlist id which would be 37i9dQZF1DZ06evO2ZpGiQ for these URLs

I also would like to have some regex that would make sure it is either one of these URL types.

So far I have tried this regex to check if it is a spotify url using this regex:

^(spotify:|https:\/\/[a-z]+\.spotify\\/) but it only matches the top URL.

I am having some trouble with Regex. Basically what I want to do is take any either of these types of spotify urls for a playlist

https://open.spotify./user/spotify/playlist/37i9dQZF1DZ06evO2ZpGiQ?si=-6S0EBlURrao__YyIOW6bg

or

spotify:user:spotify:playlist:37i9dQZF1DZ06evO2ZpGiQ

And get the user id which would be spotify for these URLs and would like to get the playlist id which would be 37i9dQZF1DZ06evO2ZpGiQ for these URLs

I also would like to have some regex that would make sure it is either one of these URL types.

So far I have tried this regex to check if it is a spotify url using this regex:

^(spotify:|https:\/\/[a-z]+\.spotify\.\/) but it only matches the top URL.

• javascript
• regex
• spotify

Share Improve this question Follow edited Jun 15, 2018 at 13:46 Fatal Dizz asked Jun 15, 2018 at 13:42 Fatal DizzFatal Dizz 5711 silver badge88 bronze badges 0

Add a ment  | 

3 Answers 3

Sorted by: Reset to default 2

Here I get the immutable parts of each candidate strings which are https://open.spotify./user/spotify/playlist and spotify:user:spotify:playlist in a first group then I capture the playlist id in a second group and the rest can be ignored.

You can see it at work there: https://regex101./r/tDtsTS/1

^(https:\/\/open.spotify.\/user\/spotify\/playlist\/|spotify:user:spotify:playlist:)([a-zA-Z0-9]+)(.*)$

For your given examples you could also match the user id and the playlist id using an alternation | for only the first part where you do not yet want to capture values and capture the separator in a capturing group ([\/:]). Then you could use a backreference \1

Then you can refer to the same group number for the username and the playlist. The username will be in group 2 and the playlist in group 3.

^(?:https:\/\/open\.spotify\.|spotify)([\/:])user\1([^\/]+)\1playlist\1([a-z0-9]+)

Details

• ^ Assert position at the start of the line
• (?: Non capturing group
  • https:\/\/open\.spotify\. Match literally (escape the dot \. to match it literally)
  • | Or
  • spotify match literally
• ) Close non capturing group
• ([\/:]) Capture / or : in a group using a character class so it can be used with a backreference to this group (group 1)
• user\1 Match user followed by the backreference \1
• ([^\/]+) Capture the user id (group 2) using a negated character class to match not a forward slash
• \1playlist\1 match playlist using 2 backreferences (like :playlist: or /playlist/)
• ([a-z0-9]+) Capturing the playlist id (group 3)

Regex demo

You could use the case insensitive flag /i to match upper and lowercase characters.

const strings = [
  'https://open.spotify./user/spotify/playlist/37i9dQZF1DZ06evO2ZpGiQ?si=-6S0EBlURrao__YyIOW6bg',
  'spotify:user:spotify:playlist:37i9dQZF1DZ06evO2ZpGiQ'
];
let regex = /^(?:https:\/\/open\.spotify\.|spotify)([\/:])user\1([^\/]+)\1playlist\1([a-z0-9]+)/gi;
strings.forEach((str) => {
  while ((m = regex.exec(str)) !== null) {
    if (m.index === regex.lastIndex) {
      regex.lastIndex++;
    }
    console.log("user id: " + m[2]);
    console.log("playlist id: " + m[3]);
  }
});

This is fairly easy, just use character classes.

Working example: https://regex101./r/eQFWuR/1

Regex spotify[\/:]playlist[\/:](.+)[\s?]