This question already has answers here:
Escaping backslash (\) in string or paths in R
(4 answers)
Closed 2 years ago.
In R, while parsing a windows directory address or in general parsing a text string with backstrokes throws the following error:
> 'C:\Users'
Error: '\U' used without hex digits in character string starting "'C:\U"
How to parse such strings?
With R>4.0.0, it is possible to parse such strings with following syntax:
> r"(C:\Users)"
[1] "C:\\Users"
Note that, () are part of syntax. For simplicity, one can also use r"{...}" and r"[...]"
Related
This question already has answers here:
Error: '\R' is an unrecognized escape in character string starting "C:\R"
(5 answers)
R - Unable to replace unrecognized escape symbol "\&" in character string
(1 answer)
Closed 24 days ago.
I want to insert a delta inside a print command in R. Expect \delta all the greek letters are coming without any error. However, the following error is prompted when trying to print \delta using the sprintf command. Can you help?
I tried searching for an answer and found one. But the solution was to use a forward slash which obviously won't work in my case.
This question already has answers here:
Escaping backslash (\) in string or paths in R
(4 answers)
Closed 1 year ago.
In how to change working directory more easily?
Currently, if we use 'setwd',we have to add many '\', sometimes it's boring
Is there any easier way for this ? (Just like Python can add 'r' )
setwd('C:\Users\Administrator\Desktop\myfolder') # can't work
setwd('C:\\Users\\Administrator\\Desktop\\myfolder') # can work,but havt to add many '\'
You could use r (for raw string) and add parenthesis:
> r"(C:\Users\Administrator\Desktop\myfolder)"
[1] "C:\\Users\\Administrator\\Desktop\\myfolder"
>
And now:
setwd(r"(C:\Users\Administrator\Desktop\myfolder)")
Or reading from clipboard automatically adds the extra slashes:
setwd(readClipboard())
This question already has answers here:
How do I deal with special characters like \^$.?*|+()[{ in my regex?
(2 answers)
Closed 4 years ago.
Similar to R - delete last two characters in string if they match criteria except I'm trying to get rid of the special character '+' as well. I also attached a picture of my output.
When I attempt to use the escape command of '+', I get an error message saying
Error: '\+' is an unrecognized escape in character string starting ""\\s\+"
As you noticed, + is a metacharacter in regex so it needs to be escaped. \+ escapes that character, but \, itself, is a special character in R character strings so it, too, needs to be escaped. This is an R requirement, not a regex requirement.
This means that, instead of '\+', you need to write '\\+'.
This question already has an answer here:
paste quotation marks into character string, within a loop
(1 answer)
Closed 5 years ago.
I am trying to get text given between “ ” to make a string. But because string has two “ already in it, I am not able to do so.
?jql=filter%20=%20"Plan%20Standup%20-%20Mutual-SA"
When I am trying to input , it is giving me an error.
Input <- "?jql=filter%20=%20"Plan%20Standup%20-%20Mutual-SA""
I tried many escape characters, but always I got an error message.
Error: unexpected symbol in "input <- "?jql=filter%20=%20"Plan"
any help will be highly appreciated
In the string, there is already a double quote. So, we can wrap it with single quotes
Input <- '?jql=filter%20=%20"Plan%20Standup%20-%20Mutual-SA'
cat(Input, "\n")
#?jql=filter%20=%20"Plan%20Standup%20-%20Mutual-SA
"Escape" the character like this
a <- "\""
This question already has answers here:
How to escape backslashes in R string
(3 answers)
Closed 5 years ago.
I have an array:
t <- c("IMCR01","IMFA02","IMFA03")
I want to make it look like this:
"\'IMCR01\'","\'IMFA02\'","\'IMFA03\'"
I tried different ways like:
paste0("\'",t,"\'")
paste0("\\'",t,"\\'")
paste0("\\\\'",t,"\\\\'")
But none of them is correct. Any other functions are OK as well.
Actually your second attempt is correct:
paste0("\\'",t,"\\'")
If you want to tell paste to use a literal backslash, you need to escape it once (but not twice, as you would need within a regex pattern). This would output the following to the console in R:
[1] "\\'IMCR01\\'" "\\'IMFA02\\'" "\\'IMFA03\\'"
The trick here is that the backslash is even being escaped by R in the console output. If you were instead to write t to a text file, you would only see a single backslash as you wanted:
write(t, file = "/path/to/your/file.txt")
But why does R need to escape backslash when writing to its own console? One possibility is that if it were to write a literal \n then this would actually be interpreted by the console as a newline. Hence the need for eacaping is still there.