Extract parameter value from url using regular expressions

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You almost had it, just need to escape special regex chars:

regex = /http\:\/\/www\.youtube\.com\/watch\?v=([\w-]{11})/;

url="http://www.youtube.com/watch?v=Ahg6qcgoay4";
id = url.match(regex)[1]; // id = 'Ahg6qcgoay4'

Edit: Fix for regex by soupagain.

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