I have a value, mystring defined below:
mystring <- "! \" # $ % & ' ( ) * + , - . / : ; < = > ? @ [ \ ] ^ _ ` { | } ~"
When I tried to extract all punctuation using string_extract_all function, some punctuation like $ and + could not be extracted. I tried to escape them with a backslash but I would get an error instead.
str_extract_all(mystring, pattern = "[[:punct:]]")
# [[1]]
# [1] "!" "\"" "#" "%" "&" "'" "(" ")" "*" "," "-" "." "/" ":" ";" # "?" "@" "[" "]" "_" "{" "}"
It works in base grepl though:
grep(pattern = "[[:punct:]]", unlist(strsplit(mystring," ")), value = TRUE)
# [1] "!" "\"" "#" "$" "%" "&" "'" "(" ")" "*" "+" "," "-" "." "/" ":" ";" "<" "=" ">" "?" "@"
# [23] "[" "]" "^" "_" "`" "{" "|" "}" "~"
Is this a bug in stringr or is there something wrong with my code?