> is it possible and if 'yes' to do the following:
>
> In a text of paragraphs, there are paragraphs containing
> a certain keyword.
> I want to delete all lines of all paragraphs containing
> the keyword except the lines containing the keyword.
> And I want to delete all paragraphs containing no keyword
> completly.
> And I want to delete all paragraphs consisting only lines
> containing the keyword.
With some constraints on your input, yes.
Constraint: All lines of a paragraph begin at the start-of-line
(no indented lines)
" indent those paragraphs containing "backup"
:sil! g/backup/'{,'}>
" delete those lines/paragraphs that didn't get marked
:g/^\S/d
" purge out those lines containing the keyword
:g/backup/d
" unindent the lines back to their original
:%s/^\s\+
" clean up any stray blank lines:
:g/^\s*$/d
Your source text adheres to the above constraint, so hopefully
this works for you. This is a variant of the "decorate, sort,
undecorate" pattern -- in this case a "decorate, process,
undecorate".
-tim
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