Re: question on VIM syntax: highlight an entire paragraph

On Sunday, April 17, 2016 at 9:34:04 AM UTC-7, ZyX wrote:
> 2016-04-17 17:52 GMT+03:00 porphyry5 >:
> > On Saturday, April 16, 2016 at 3:48:52 PM UTC-7, Jose Caballero wrote:
> >> Is it possible to highlight an entire paragraph based on a single line content?
> >> I would be interested in changing the color of an entire block of
> >> configuration lines if one of those lines in the block is "enabled =
> >> False", for example.
> >>
> >> I am so new to this (*) that I am not even sure what would be the key
> >> words to search for it on google.... So any tip or advice is more than
> >> welcome.
> >>
> >> What is a "paragraph"? Also what exactly you mean by "highlight",
> >>
> >>
> >>
> >>
> >>
> >> Fair questions, I guess. I will try to be more clear.
> >>
> >>
> >> I would like to have a VIM syntax file that changes the color or entire paragraphs (a set of lines between two blank lines) if one of the lines in the paragraph matches pattern
> >> "enabled = False".
> >>
> >>
> >> I hope now I explained myself better.
> >>
> >>
> >> Jose
> >
> > If you use search hilighting this might do what you want
> > /\n\(.*\n\)\{-}.*enabled = False.*\n\(.*\n\)\{-}\n
>
> It will not.
>
> 1. I did mess up with \@= and \@<= for a reason. Without them regex
> will not highlight successive matches.
> 2. It does not highlight an entire paragraph *ever*. \n\(.*\n\) does
> *not* match *only* at the empty line. It matches everywhere where
> there are two successive lines.
> 3. First \{-} does *not* work like you think. In
>
> foo
> enabled = True
>
> enabled = False
> bar
>
> test
>
> it will highlight starting from the EOL at the first line till EOL
> just below bar. Engine captures the first place where \n matches tries
> to match the following \(…\)\{-} as less times as possible, then
> proceeds with the rest of the pattern. If matching succeeds it has
> absolutely no reason to retry from the other place where \n matches
> just to make sure \(…\)\{-} is matched even less times.
> 4. Your regex does not work for sections which are placed at the end
> of the file.
> 5. Your regex works for sections which are placed at the beginning of
> the file only because of 2. But it will not work if `enabled = False`
> is the very first line in the file.
>
> >
> > --
> > --
If I understand you rightly you are saying that a regex must be written not only to identify what one wants, but also to strictly exclude what one does not want.

In this instance the sequence '.*\n' will include any number of empty lines that precede 'enable=False', whereas the 2nd empty line must always terminate the match process instantly.

And using '.\+\n' will fail if 'enable=False' follows an empty line, so my venture here is a dead end.

Thank you for the insight.

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