(fix formatting) Tag: Visual edit |
Tags: Visual edit apiedit |
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==Comments== |
==Comments== |
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+ | Can we delete/not delete the line that precedes the search string? |
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+ | like, in the below example i want the command to search for "keyword" and then ratain that and the line before that and deletes the test? Thank you! |
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+ | << file starts>> |
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+ | this is the line that preceeds the search string |
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+ | keyword |
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+ | asdfgf asdfgf |
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+ | lkjhj lkjhj |
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+ | << file ends>> |
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Can we remove all even numbered lines in a file using this feature. can we do some kind of math in the pattern. (ex: \=line(".") % 2) |
Can we remove all even numbered lines in a file using this feature. can we do some kind of math in the pattern. (ex: \=line(".") % 2) |
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Revision as of 19:28, 20 May 2015
created 2002 · complexity basic · author tarjei · version 5.7
The ex command g
is very useful for acting on lines that match a pattern. You can use it with the d
command, to delete all lines that contain a particular pattern, or all lines that do not contain a pattern.
For example, to delete all lines containing "profile" (remove the /d
to show the lines that the command will delete):
:g/profile/d
More complex patterns can be used, such as deleting all lines that are empty or that contain only whitespace:
:g/^\s*$/d
To delete all lines that do not contain a pattern, use g!
, like this command to delete all lines that are not comment lines in a Vim script:
:g!/^\s*"/d
Note that g!
is equivalent to v
, so you could also do the above with:
:v/^\s*"/d
The next example shows use of \|
("or") to delete all lines except those that contain "error
" or "warn
" or "fail
" (:help pattern):
:v/error\|warn\|fail/d
See also
- Remove unwanted empty lines
- Filter buffer on a search result
- Folding with Regular Expression
- Power of g
Comments
Can we delete/not delete the line that precedes the search string?
like, in the below example i want the command to search for "keyword" and then ratain that and the line before that and deletes the test? Thank you!
<< file starts>>
this is the line that preceeds the search string
keyword
asdfgf asdfgf
lkjhj lkjhj
<< file ends>>
Can we remove all even numbered lines in a file using this feature. can we do some kind of math in the pattern. (ex: \=line(".") % 2)
Not really, but you can do that in two steps:
:g/.*/if line('.')%2|call setline(line('.'), '===delete===')|endif :g/^==delete==$/d
If you simply put delete inside the if statement all the lines will be deleted. Much faster solution is to record a macro "ddj" and play it over the file. You could delete lines from several different ranges:
:let range = range(10,15)+range(20,25)+range(30,35) :g/.*/if index(range, line('.')) != -1|call setline(line('.'), '===delete===')|endif :g/^===delete===$/d
But again I think the faster way to do that is to use :[range]d several times.
How would you instead of deleting, replace matched lines with a single newline between remaining lines?