How to do case insensitive search in Vim
SearchVimCase InsensitiveSearch Problem Overview
I'd like to search for an upper case word, for example COPYRIGHT in a file. I tried performing a search like:
/copyright/i # Doesn't work
but it doesn't work. I know that in Perl, if I give the i
flag into a regex it will turn the regex into a case-insensitive regex. It seems that Vim has its own way to indicate a case-insensitive regex.
Search Solutions
Solution 1 - Search
You can use the \c
escape sequence anywhere in the pattern. For example:
/\ccopyright
or /copyright\c
or even /copyri\cght
To do the inverse (case sensitive matching), use \C
(capital C) instead.
Solution 2 - Search
As well as the suggestions for \c
and ignorecase
, I find the smartcase
very useful. If you search for something containing uppercase characters, it will do a case sensitive search; if you search for something purely lowercase, it will do a case insensitive search. You can use \c
and \C
to override this:
:set ignorecase
:set smartcase
/copyright " Case insensitive
/Copyright " Case sensitive
/copyright\C " Case sensitive
/Copyright\c " Case insensitive
See:
:help /\c
:help /\C
:help 'smartcase'
Solution 3 - Search
You can set the ic
option in Vim before the search:
:set ic
To go back to case-sensitive searches use:
:set noic
ic
is shorthand for ignorecase
Solution 4 - Search
You can issue the command
:set ignorecase
and after that your searches will be case-insensitive.
Solution 5 - Search
To switch between case sensitive and insensitive search I use this mapping in my .vimrc
nmap <F9> :set ignorecase! ignorecase?
Solution 6 - Search
You can use in your vimrc
those commands:
set ignorecase
- All your searches will be case insensitiveset smartcase
- Your search will be case sensitive if it contains an uppercase letter
You need to set ignorecase
if you want to use what smartcase
provides.
I wrote recently an article about Vim search commands (both built in command and the best plugins to search efficiently).
Solution 7 - Search
As others suggested:
:set ic
But the cool stuff is You can toggle such modes with:
:set ic!
Solution 8 - Search
vim[grep]
command..
The good old :vimgrep /example\c/ &
- \c for case insensitive
- \C for case sensitive
- % is to search in the current buffer
Solution 9 - Search
put this command in your vimrc file
set ic
always do case insensitive search
Solution 10 - Search
I prefer to use \c
at the end of the search string:
/copyright\c
Solution 11 - Search
By default, all searches in vi are case-sensitive. To do a case-insensitive search, go into command mode (press Escape), and type-
:set ignorecase
You can also type -
:set ic
as an abbreviation.
To change back to case-sensitive mode, type-
:set noignorecase
or :set noic
in command mode
Solution 12 - Search
As @huyz mention sometimes desired behavior is using case-insensitive searches but case-sensitive substitutions. My solution for that:
nnoremap / /\c
nnoremap ? ?\c
With that always when you hit /
or ?
it will add \c
for case-insensitive search.
Solution 13 - Search
Vim have 2 modes
1.edit mode
- normal mode( Esc )
Search will work for normal mode
/\c for case sensitive
/\csearch
Solution 14 - Search
You can set ignorecase
by default, run this in shell
echo "set ic" >> ~/.vimrc
Solution 15 - Search
Note it is a difference where you place modifiers such as "\c" in your expresion:
> You can use the \c escape sequence anywhere in the pattern
Regardless from the accepted answers, which states that it is no difference of where to place modyfier in a regex pattern, its looks like it actually does matter.
example text:
asdasdasdasdasd wiktor asdasdasdasd
adasdasdasd wiktor asdasda ahjkjlkhjkl
asdasd asd asdasdasdasd iuuuu -
asdjkkkkkkkaopbsdasda
wiktor ----(---------------------)--
Match
\c^.*A?.*$
^\c.*A?.*$
^.*\cA?.*$
^.*A\c?.*$
No match
^.\c*A?.*$
^.*A?\c.*$
^.*A?.\c*$
^.*A?.*$\c
-
vim -version
VIM - Vi IMproved 8.2 (2019 Dec 12, compiled Jun 1 2020 06:42:35) Included patches: 1-869
Solution 16 - Search
Some important information, if u want to find out more about the commands of vim, as mentioned below u can give a try the following steps :
- invoke the command "help" follow by a space and then complete the word with TAB key, once u find the right command press return key.
:help ignorecase
- information like the following will be displayed :
- you will be able to move forward and backward and also watch the short command, such as the case of "ignorecase" ( 'ic' ). In addition, another short example could be the case of 'smartcase' ('scs' and some more) :
- In order to leave of the documentation just type ":q" as usual and you will return to "command mode" .
:q
I really hope the information provided would be helpful for someone.
Best regards,