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Revision as of 08:59, December 21, 2012

Tip 213 Printable Monobook Previous Next

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" (the first command is optional; it shows the lines that the second command will delete):


More complex patterns can be used, such as deleting all lines that are empty or that contain only whitespace:


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:


Note that g! is equivalent to v, so you could also do the above with:


The next example shows use of \| ("or") to delete all lines except those that contain "error" or "warn" or "fail" (:help pattern):


See also


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

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

But again I think the faster way to do that is to use :[range]d several times.

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