I’ve read this question, but I want to know how can I delete the line when the pattern DOESN’T occur.
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I’ve read this question, but I want to know how can I delete the line when the pattern DOESN’T occur.
Deleting the rest of the line when a pattern does not occur is … hard for me to understand.
Did you mean, delete the whole line if it doesn’t have a pattern?
If you meant, preserve the line but clobber the characters: