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rated 0 times [ 33] [ 7] / answers: 1 / hits: 58618 / 11 Years ago, thu, october 24, 2013, 12:00:00

I have a regex pattern that I'm using (got it from Stack Overflow) to extract a video ID from a vimeo URL:

var regExp = /http://(www.)?vimeo.com/(d+)($|/)/;

    var match = url.match(regExp);

I need it to work whether http or https is specified. I've tried

var regExp = /http(s)?://(www.)?vimeo.com/(d+)($|/)/;

But this fails on both http and https.

Help a brother out.

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answered 11 Years ago aiyannam · Accepted Answer

It fails because you are creating an extra capturing group, meaning that the capturing group indexes will not be the same as before.

To make the s optionnal without creating a capturing group, you can simply add ?, you do not need the parenthesis.

/https?://(www.)?vimeo.com/(d+)($|/)/

To create a non-capturing group, you can use (?:), but that's not necessary here, just showing for the example:

/http(?:s)?://(www.)?vimeo.com/(d+)($|/)/