在正则表达式中使用'\\ s'vs''，是'\\'s同时寻找空格和反斜杠？

Question

假设我使用下面的字符串：

x <- "County                           January 2016 February 2016         March 2016         April 2016       May 2016           June 2016         July 2016      August 2016 September 2016 October 2016             November 2016 December 2016\r"

通过运行以下两个命令我收集到的是'\ s'将寻找''（空格）以及'\'反斜杠。

strsplit(x, "(?<=2016) +", perl=T)
[[1]]
 [1] "County                           January 2016"
 [2] "February 2016"                                
 [3] "March 2016"                                   
 [4] "April 2016"                                   
 [5] "May 2016"                                     
 [6] "June 2016"                                    
 [7] "July 2016"                                    
 [8] "August 2016"                                  
 [9] "September 2016"                               
[10] "October 2016"                                 
[11] "November 2016"                                
[12] "December 2016\r"                              

strsplit(x, "(?<=2016)\\s+", perl=T)
[[1]]
 [1] "County                           January 2016"
 [2] "February 2016"                                
 [3] "March 2016"                                   
 [4] "April 2016"                                   
 [5] "May 2016"                                     
 [6] "June 2016"                                    
 [7] "July 2016"                                    
 [8] "August 2016"                                  
 [9] "September 2016"                               
[10] "October 2016"                                 
[11] "November 2016"                                
[12] "December 2016"

由于第二个命令在2016年之后也分裂为'\'。我理解这是正确的吗？感谢帮助谢谢。