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Oliver Eyton-Williams 0bd52f8bd1 Feat: add new Markdown parser (#39800 )

and change all the challenges to new `md` format.

2020-11-27 10:02:05 -08:00

id, title, challengeType, videoId

id	title	challengeType	videoId
5e7b9f0b0b6c005b0e76f06f	Regular Expressions: Matching and Extracting Data	11	LaCZnTbQGkE

--question--

--text--

What will the following program print?:

import re
s = 'A message from csev@umich.edu to cwen@iupui.edu about meeting @2PM'
lst = re.findall('\\S+@\\S+', s)
print(lst)

['umich.edu', 'iupui.edu']

['csev@', 'cwen@']