[R如何分割字符串

Question

我有一个像

a <- "Hi. I m cool, but I need help!" 

一个字符串，并作为输出我想有

"hi" "." "I" "m" "cool" "," "but" "I" "need" "help" "!" 

而且我不希望使用额外的软件包。

Answer 1

我们可以使用strsplit

a1 <- strsplit(a, '\\s|(?=[!,.])\\s*', perl = TRUE)[[1]] 
a1[nzchar(a1)] 
#[1] "Hi" "." "I" "m" "cool" "," "but" "I" "need" "help" "!"