R split on delimiter (split) 保持分隔符 (split)答案

【问题标题】：R split on delimiter (split) keep the delimiter (split)R split on delimiter (split) 保持分隔符 (split)
【发布时间】：2014-02-24 21:58:41
【问题描述】：

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)。所以所需的输出是：

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

【问题讨论】：

标签： regex string r split

【解决方案1】：

你可以使用"(?<=DELIMITERS)":

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

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

【讨论】：

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