Re: how to delete lines containing a pattern and not containing another pattern?

On Thursday, January 23, 2014 8:51:16 AM UTC-6, Chan Kim wrote:
>  
> I'm a long-time vi(m) user and I have question.
> Can I remove lines that contain a pattern but not another pattern?
> For example,
>  
> Line 1 : rabbit
> Line 2 : arch sparc
> Line 3 : arch arm
> Line 4 : tiger
> I want to remove lines containing arch but not containing sparc.
> So Here I want to remove only line 3 leaving lines 1, 3 and 4 intact.
>  

I'd approach this as "on every line containing arch, delete the line if it does
not contain sparc". This can be done as follows:

:g#arch#if getline('.')!~'sparc' | d | endif

Note I used !~ for a regular expression match which respects the 'ignorecase'
setting. I think this is appropriate here since you are doing this
interactively; if you were writing a plugin or you need strict case sensitivity
(or insensitivity) then you should use !~# or !~?.

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