查找单词末尾或点前面有“<-”的所有单词

如果您想要所有基本包替换函数及其各自的S3方法,可以尝试

ls(envir = as.environment("package:base"), pattern = "<-")

在未加载包的情况下,这会产生以下结果:

 [1] "<<-"                     "<-"                      "[<-"                    
 [4] "[[<-"                    "@<-"                     "$<-"                    
 [7] "attr<-"                  "attributes<-"            "body<-"                 
[10] "class<-"                 "colnames<-"              "comment<-"              
[13] "[<-.data.frame"          "[[<-.data.frame"         "$<-.data.frame"         
[16] "[<-.Date"                "diag<-"                  "dim<-"                  
[19] "dimnames<-"              "dimnames<-.data.frame"   "Encoding<-"             
[22] "environment<-"           "[<-.factor"              "[[<-.factor"            
[25] "formals<-"               "is.na<-"                 "is.na<-.default"        
[28] "is.na<-.factor"          "is.na<-.numeric_version" "length<-"               
[31] "length<-.factor"         "levels<-"                "levels<-.factor"        
[34] "mode<-"                  "mostattributes<-"        "names<-"                
[37] "names<-.POSIXlt"         "[<-.numeric_version"     "[[<-.numeric_version"   
[40] "oldClass<-"              "parent.env<-"            "[<-.POSIXct"            
[43] "[<-.POSIXlt"             "regmatches<-"            "row.names<-"            
[46] "rownames<-"              "row.names<-.data.frame"  "row.names<-.default"    
[49] "split<-"                 "split<-.data.frame"      "split<-.default"        
[52] "storage.mode<-"          "substr<-"                "substring<-"            
[55] "units<-"                 "units<-.difftime"

感谢@42帮助我改进了这个答案。

我们可以试试

library(stringr)
str_extract(v1, "\\w+<-$|\\w*<-\\.\\S+")
#[1] "split<-.data.frame" NA                   "splitdata<-"    

数据

v1 <-  c("split<-.data.frame", "split<-data", "splitdata<-")