regex - R split on delimiter (split) 保留分隔符 (split)

Question

在 R 中，您可以使用 strsplit在分隔符( split )上分割向量的函数如下:

x <- "What is this?  It's an onion.  What! That's| Well Crazy."
unlist(strsplit(x, "[\\?\\.\\!\\|]", perl=TRUE))

## [1] "What is this"    "  It's an onion" "  What"          " That's"        
## [5] " Well Crazy"

我想使用 R 保留分隔符( split )。所以所需的输出是:

## [1] "What is this?"    "  It's an onion." "  What!"          " That's|"        
## [5] " Well Crazy."

Answer 1

您可以使用 "(?<=DELIMITERS)" :

unlist(strsplit(x, "(?<=[?.!|])", perl=TRUE))

## [1] "What is this?"    "  It's an onion." "  What!"          " That's|"        
## [5] " Well Crazy.