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Asked: 2026-05-14T20:08:26+00:00

I need to grab the video ID from a Google Video URL. There are

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I need to grab the video ID from a Google Video URL. There are two different types of URLs that I need to be able to match:

http://video.google.com/videoplay?docid=-3498228245415745977#

where I need to be able to match -3498228245415745977 (note the dash; -), and

video.google.com/videoplay?docid=-3498228245415745977#docid=2728972720932273543

where I need to match 2728972720932273543. Is there any good regular expression that can match this?

This is what I’ve got so far: @"docid=(-?\d{19}+)" since the video ID seems to be 19 characters except when it’s prefixed with the dash.

I’m using C# (of which I have very little experience) if that changes anything.

P.s. I would also appreciate you review my regular expressions for YouTube (@"[\?&]v=([^&#])";), RedTube (@"/(\d{1,6})") and Vimeo (@"/(\d*)").

I do not expect users to enter the full URL and thus do not match the ^http://\\.?sitename+\\.\\w{2,3}.

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1 Answer

  1. Editorial Team

    The following piece of RegEx uses what is called negative lookahead to make sure that there is not any part of the string after the match that contains #docid:

    docid=(-?\d{19}(?!\#docid=))

    the (?!\#docid=) is the negative lookahead part of the RegEx. If you want to know more about it you could look at http://www.regular-expressions.info/lookaround.html

    Hope this helps you

    EDIT:
    If you haven’t already gotten it you should get “The Regulator 2.0” from sourceforge. Its an Design and testing tool for Regular Expressions. I find it very helpful when I develope regular expressions.

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