I have a text file ending with "empty_space\n"
...{empty_space}
...{empty_space}
I want to remove the empty spaces at the end so to say.
...
...
How can I do that?
Try this:
:%s/\v\s+$//
: Ex command
% on all lines
s substitute
/ start pattern
\v very magic mode (makes \s available)
\s any whitespace
+ one or more characters
$ end of line
/ end of pattern
empty replacement
/ end of replacement
:%s/ $// should work.
Let me break it down
:<- command mode
%s find each occcurence
then the regular expressions to be matched and replaced by.
Related
I have a file which is as following
!J INCé0001438823
#1 A LIFESAFER HOLDINGS, INC.é0001509607
#1 ARIZONA DISCOUNT PROPERTIES LLCé0001457512
#1 PAINTBALL CORPé0001433777
$ LLCé0001427189
$AVY, INC.é0001655250
& S MEDIA GROUP LLCé0001447162
I just want to keep the last 10 characters of each line so that it becomes as following:-
0001438823
0001509607
0001457512
0001433777
0001427189
0001655250
:%s/.*\(.\{10\}\)/\1
: ex-commaned
% entire file
s/ substitute
.* anything (greedy)
. followed by any character
\{10\} exactly 10 of them
\( \) put them in a match group
/ replace with
\1 said match group
I would treat this as a shell script problem. Enter the following in vim:
:%! rev|cut -c1-10|rev
The :%! will pipe the entire buffer through the following filter, and then the filter comes straight from here.
for a single line you could use:
$9hd0
$ go to end of line
9h go 9 characters left
d0 delete to beginning of line
Assuming the é character appears only once in a line, and only before your target ten digits, then this would seem to work:
:% s/^.*é//
: command
% all lines
s/ / substitute (i.e., search-and-replace) the stuff between / and /
^ search from beginning of line,
. including any character (wildcard),
* any number of the preceding character,
é finding "é";
// replace with the stuff between / and / (i.e., nothing)
Note that you can type the é character by using ctrl-k e' (control-k, then e, then apostrophe, without spaces). On my system at least, this works in insert mode and when typing the "substitute" command. (To see the list of characters you can invoke with the ctrl-k "digraph" feature, use :dig or :digraph.
In text file,
_MACRO_CALL
_MACRO_CALL (param)
I need to replace _MACRO_CALL(only First line) by _MACRO_CALL;
How to do this?
Ctrl+H
Find what: _MACRO_CALL\K$
Replace with: ;
CHECK Match case
CHECK Wrap around
CHECK Regular expression
Replace all
Explanation:
_MACRO_CALL # literally
\K # forget all we have seen until this position
$ # end of line
Screenshot (before):
Screenshot (after):
vim: insert original line number in g/pattern/move $
I'm debugging some event order in a log and like to check two set of events sequence by the line number of the showing log. Usually, I used g/pattern/move $ for some interesting info. But I cannot find a way to insert the original line number of them. Please help.
I tried :
g/pattern/move $; printf("%d",line("."))
but it does not work.
Can't help thinking of something very straightforward, for example:
g/pattern/call append(line('$'), line('.') . ' ' . getline('.'))
A slightly different way but I have following mapping in my _vimrc
nnoremap <F3> :redir! #f<cr>:silent g//<cr>:redir! END<cr>:enew!<cr>:put! f<cr>:let #f=#/<cr>:g/^$/d<cr>:let #/=#f<cr>gg
It opens a new buffer with all your search matches, including the linenumbers where the match occured.
I have figured out a way to insert at first the line number on the lines that have the pattern and after that moving the same lines to the end of the file:
:%s,\v^\ze.*pattern,\=line('.') . ' ' ,g | g/pattern/m$
We have two commands:
:%s,\v^\ze.*pattern,\=line('.') . ' ' ,g
, ....................... we are using comma as delimiter
\v ...................... very magic substitution
^ ....................... Regular expression for beginning of line
\ze ..................... indicates that all after it will not be substituted
\=line('.') ............. gets the line number
. ' ' .................. concatenates one space after the number
The second command is separated with |
g/pattern/m$
m$ ....................... moves the pattern to the end of file
Assuming I have the following string:
abcdefghi
Which command can I use so that the outcome is:
a
b
c
d
e
f
g
h
i
I just started coding so I hope someone can help me.
There is a tool called fold which inserts linebreaks, and you can tell it do add one after every character:
$ fold -w 1 <<< 'abcdefghi'
a
b
c
d
e
f
g
h
i
<<< is used to indicate a here string. If your shell doesn't support that, you can pipe to fold instead:
echo 'abcdefghi' | fold -w 1
You can use sed, although it will add an extra newline after the last letter so you get a blank line at the end:
$ sed 's/./&\
/g' <<<abcdefghi
a
b
c
d
e
f
g
h
i
$
s/old/new/ is the sed "substitute" command. On the old side, the pattern . matches any character at all. On the new side, the symbol & means "whatever the old pattern matched" - we include what we match in the replacement so we are adding things, not removing them.
We want to follow each matched character with a newline, but the newline will terminate the sed command and result in a syntax error unless we put a backslash in front of it.
So we are replacing any character at all (.) with that same character (&) followed by a newline (\ + newline). The g on the end means to replace every occurrence, not just the first one on each line.
The demonstration uses a here-string, which is part of most modern shells but not all; you could also do it with echo abcdefghi | sed '...'.
grep -o . <<< "abcdefghi"
I would like to use vim's substitute function (:%s) to search and replace a certain pattern of code. For example if I have code similar to the following:
if(!foo)
I would like to replace it with:
if(foo == NULL)
However, foo is just an example. The variable name can be anything.
This is what I came up with for my vim command:
:%s/if(!.*)/if(.* == NULL)/gc
It searches the statements correctly, but it tries to replace it with ".*" instead of the variable that's there (i.e "foo"). Is there a way to do what I am asking with vim?
If not, is there any other editor/tools I can use to help me with modifications like these?
Thanks in advance!
You need to use capture grouping and backreferencing in order to achieve that:
Pattern String sub. flags
|---------| |------------| |-|
:%s/if(!\(.*\))/if(\1 == NULL)/gc
|---| |--|
| ^
|________|
The matched string in pattern will be exactly repeated in string substitution
:help /\(
\(\) A pattern enclosed by escaped parentheses. /\(/\(\) /\)
E.g., "\(^a\)" matches 'a' at the start of a line.
E51 E54 E55 E872 E873
\1 Matches the same string that was matched by /\1 E65
the first sub-expression in \( and \). {not in Vi}
Example: "\([a-z]\).\1" matches "ata", "ehe", "tot", etc.
\2 Like "\1", but uses second sub-expression, /\2
... /\3
\9 Like "\1", but uses ninth sub-expression. /\9
Note: The numbering of groups is done based on which "\(" comes first
in the pattern (going left to right), NOT based on what is matched
first.
You can use
:%s/if(!\(.*\))/if(\1 == NULL)/gc
By putting .* in \( \) you make numbered captured group, which means that the regex will capture what is in .*
When the replace starts then by using \1 you will print the captured group.
A macro is easy in this case, just do the following:
qa .............. starts macro 'a'
f! .............. jumps to next '!'
x ............... erase that
e ............... jump to the end of word
a ............... starts append mode (insert)
== NULL ........ literal == NULL
<ESC> ........... stop insert mode
q ............... stops macro 'a'
:%norm #a ........ apply marco 'a' in the whole file
:g/^if(!/ norm #a apply macro 'a' in the lines starting with if...
Try the following:
%s/if(!\(.\{-}\))/if(\1 == NULL)/gc
The quantifier .\{-} matches a non-empty word, as few as possible (more strict than .*).
The paranthesis \( and \) are used to divide the searched expression into subexpressions, so that you can use those subgroups in the substitute string.
Finally, \1 allows the user to use the first matched subexpression, in our case it is whatever is caught inside the paranthesis.
I hope this is more clear, more information can be found here. And thanks for the comment that suggests improving the answer.