This regex :
str_extract_all("This is a Test , ' ' " , "[a-z]+")
returns :
[1] "his" "is" "a" "est"
How to modify so this is case insensitive ?
`[1] "This" "is" "a" "Test"`
should instead be returned
Should /i
remove case sensitive ?
Trying str_extract_all("This is a Test , ' ' " , "[az]+/i")
returns
[[1]]
character(0)
There is a special notation for stringr functions :
regex(pattern, ignore_case = FALSE, multiline = FALSE, comments = FALSE, dotall = FALSE, ...)
You may use
> str_extract_all("This is a Test , ' ' " , regex("[a-z]+", ignore_case=TRUE))
[[1]]
[1] "This" "is" "a" "Test"
Alternatively, use an inline i
modifier (?i)
:
str_extract_all("This is a Test , ' ' " , "(?i)[a-z]+")
You could try including the capital letters in the set you're searching for.
str_extract_all("This is a Test , ' ' " , "[A-Za-z]+")
If you only want the first letter to be capitalized you could try the code below. It lets the first letter be case insensitive and then have only lowercase afterward.
str_extract_all("This is a Test , ' ' " , "[A-Za-z][a-z]*")
The technical post webpages of this site follow the CC BY-SA 4.0 protocol. If you need to reprint, please indicate the site URL or the original address.Any question please contact:yoyou2525@163.com.