How to delete all lines that do NOT contain a certain word in Vim?

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Music by Eric Matyas
https://www.soundimage.org
Track title: Thinking It Over

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Chapters
00:00 Question
00:26 Accepted answer (Score 295)
00:53 Answer 2 (Score 46)
01:09 Answer 3 (Score 12)
01:36 Thank you

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Full question
https://superuser.com/questions/265085/h...

Answer 2 links:
https://stackoverflow.com/questions/1725...

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Tags
#vim #regex #findandreplace

#avk47