How to match whitespace in sed?

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Chapters
00:00 Question
00:25 Accepted answer (Score 328)
01:08 Answer 2 (Score 104)
01:21 Answer 3 (Score 15)
01:30 Answer 4 (Score 15)
01:54 Thank you

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Full question
https://superuser.com/questions/112834/h...

Accepted answer links:
[sed]: http://pubs.opengroup.org/onlinepubs/009...
[BREs]: http://pubs.opengroup.org/onlinepubs/009...

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Tags
#sed #whitespace

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