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krisajenkins/gist:5165b16e059f01bc44d1

Created April 20, 2015 10:40
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JavaScript regexes are stateful!
Raw
gistfile1.txt
var youtubeRegexp = /https?:\/\/(?:[0-9A-Z-]+\.)?(?:youtu\.be\/|youtube(?:-nocookie)?\.com\S*[^\w\s-])([\w-]{11})(?=[^\w-]|$)(?![?=&+%\w.-]*(?:['][^<>]*>|<\/a>))[?=&+%\w.-]*/gi;
console.log(youtubeRegexp.test("https://www.youtube.com/watch?v=o4nCcgWFEwU"));
console.log(youtubeRegexp.test("https://www.youtube.com/watch?v=o4nCcgWFEwU"));
console.log(youtubeRegexp.test("https://www.youtube.com/watch?v=o4nCcgWFEwU"));
console.log(youtubeRegexp.test("https://www.youtube.com/watch?v=o4nCcgWFEwU"));
console.log(youtubeRegexp.test("https://www.youtube.com/watch?v=o4nCcgWFEwU"));
console.log(youtubeRegexp.test("https://www.youtube.com/watch?v=o4nCcgWFEwU"));
// Prints true, false, true, false...
@VRMink
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VRMink commented Apr 20, 2015

http://www.ecma-international.org/ecma-262/5.1/#sec-15.10.6.2
http://www.ecma-international.org/ecma-262/5.1/#sec-15.10.6.3

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