Extracting ID from Vimeo URL using JavaScript

Hello, I'm using this code to extract the ID from a Vimeo URL:

vimeo_id = message.split(/video\/|http:\/\/vimeo\.com\//)[1].split(/[?&]/)[0];

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But this code doesn't work when there's https instead of http. How can I make it work with https too? I prefer to keep the split instead of using a regexp if possible.

And how does this code work? Can you explain it?

Thanks.
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ivanblueAsked:
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leakim971PluritechnicianCommented:
Add << s? >>  after http

http://www.regular-expressions.info/optional.html

vimeo_id = message.split(/video\/|https?:\/\/vimeo\.com\//)[1].split(/[?&]/)[0];

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ivanblueAuthor Commented:
It works perfectly! Can you please explain how this works?
Thanks so much!
leakim971PluritechnicianCommented:
Did you check the link provided?
ivanblueAuthor Commented:
Yes, now I did. Thanks leakim971!
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