}, {
'url': 'https://www.safaribooksonline.com/api/v1/book/9780133392838/chapter/part00.html',
'only_matching': True,
+ }, {
+ # non-digits in course id
+ 'url': 'https://www.safaribooksonline.com/library/view/create-a-nodejs/100000006A0210/part00.html',
+ 'only_matching': True,
}]
def _real_extract(self, url):