R按分隔符拆分(split)并保留分隔符(split)

Question

在R中，您可以使用strsplit函数按照分隔符(split)来拆分向量，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），所以期望的输出应该是：

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

- Tyler Rinker

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.

- Tyler Rinker

---

您不需要所有的反斜杠。unlist(strsplit(x, "(?<=[?.!|])", perl=TRUE)) 返回相同的结果。 - Jake Burkhead

希望有一个选项，其中拆分是一个序列（例如“[0-9]+”），而不是单个字符... - dsz