Search & Match Regex In Javascript

Question

I am trying to get youtube video id from a different set of Youtube URL'S. I wrote the below regex for getting video id from a set of youtube URLs. I wrote this in python.

But,

The problem is can we implement the same logic in javascript as well? Since I am quite new to javascript, I need help with it.

if data.startswith('https://') or data.startswith('http://'):
        v = re.search("(?:\/|%3D|v=|vi=)([0-9A-z-_]{11})(?:[%#?&]|$)", data)
        data="https://www.youtube.com/watch?v="+v.group(1)

*The above code is in python, data is a Youtube URL. (I have tried multiple times, but didn't work for me, Hence here.)

JavaScript has a `startsWith()` method on strings, just like Python does, so that logic is the same. — Barmar, Jun 12 '20 at 16:48
[JavaScript regexp tutorial](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Regular_Expressions) — Barmar, Jun 12 '20 at 16:49
appreciate your answer, but what is equivalent for search & group in javascript ? — shriniket deshmukh, Jun 12 '20 at 16:50
`groups = data.match(/regexp/)`. Then use `groups[1]`. Isn't that explained in the tutorial? — Barmar, Jun 12 '20 at 16:52
Thank you so much @Barmar , I just don't know why commmutity criticizes question, when someone is in problem ? — shriniket deshmukh, Jun 12 '20 at 16:54
Because SO is not a tutoring service, you're expected to try to solve the problem yourself, then come here if you can't get it working. — Barmar, Jun 12 '20 at 16:54
@Barmar, I am not saying it at all. I am here because I didn't understand a thing in JS, hence I needed help. (PS: Why would anybody come to SO without any effort?) — shriniket deshmukh, Jun 12 '20 at 16:57
this `[0-9A-z-_]` ? `A-z` include punct ? and [0-9A-z`-`_] is invalid range on most enjins. JS see it as a literal. sloppy — , Jun 12 '20 at 16:59
You say you tried multiple times, so why can't you just post what you tried, so we can explain where you went wrong? That way you'll learn better than us just spoon-feeding you the solution. — Barmar, Jun 12 '20 at 17:02
gonna leap off say this was intent `/(?:\/|%3D|vi?=)([\w-]{11})(?=[%#?&]|$)/` — , Jun 12 '20 at 17:03

score 0 · Answer 1 · answered Jun 12 '20 at 16:56

0

JS has the same function so the functionality will be the same check it here JS startsWith function

answered Jun 12 '20 at 16:56

Malik Türk

55
1
8

Thanks @Malik appreciate it. – shriniket deshmukh Jun 12 '20 at 16:58
His main question is about the regexp – Barmar Jun 12 '20 at 16:58
@shriniketdeshmukh actually in JS if you want to get the video ID you don't need regex check this https://stackoverflow.com/questions/3452546/how-do-i-get-the-youtube-video-id-from-a-url – Malik Türk Jun 12 '20 at 17:07
@MalikTürk, Yeah, but Youtube has all sorts of URLs like embed,watch, and other. So will it work for every case ? – shriniket deshmukh Jun 12 '20 at 17:11
if I remember correctly, every YT video ID will be after the `?v=` so it should work with all cases – Malik Türk Jun 12 '20 at 17:15
@MalikTürk, Actually have a list of Youtube URLs, will share it with you. Please refer https://gist.github.com/rodrigoborgesdeoliveira/987683cfbfcc8d800192da1e73adc486 – shriniket deshmukh Jun 12 '20 at 17:17

Barmar · Accepted Answer · 2020-06-12T17:28:57.150

0

The JavaScript equivalent of startswith is startsWith.

The JS equivalent of re.search() is String.prototype.match(). It returns an array containing the whole match and captured groups.

A-z is an incorrect range in the regexp. Use A-Z or a-z, along with the i modifier to make the regexp case-insensitive.

var data = 'http://www.youtube.com/watch?v=-wtIMTCHWuI';
if (data.startsWith('https://') || data.startsWith('http://')) {
  v = data.match(/(?:\/|%3D|v=|vi=)([0-9A-Z-_]{11})(?:[%#?&]|$)/i);
  if (v) {
    data = "https://www.youtube.com/watch?v=" + v[1];
  }
  console.log(data);
}

edited Jun 12 '20 at 17:28

answered Jun 12 '20 at 17:01

Barmar

596,455
48
393
495

Hi @Barmar, I really appreciate the efforts you are putting in. Just wanted to share that the above code just doesn't work for this URL: http://www.youtube.com/watch?v=-wtIMTCHWuI – shriniket deshmukh Jun 12 '20 at 17:24
You can refer for other URL formats as well : https://gist.github.com/rodrigoborgesdeoliveira/987683cfbfcc8d800192da1e73adc486 – shriniket deshmukh Jun 12 '20 at 17:24
I accidentally deleted the first `(` in the regexp. – Barmar Jun 12 '20 at 17:29
no worries Just worked like charm! Thanks a lot for helping me out. Do let me know if something I could do for you. – shriniket deshmukh Jun 12 '20 at 17:34

Search & Match Regex In Javascript

2 Answers2