R拆分分隔符（拆分）保留分隔符（拆分）

Question

在R中，您可以使用strsplit函数在分隔符（split）上拆分向量，如下所示：

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）。所以期望的输出是：

## [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.