1、R語言strsplit用於分割字符串
創建測試數據
> test <- "aa bb cc dd ee ff" ##創建測試數據
> test [1] "aa bb cc dd ee ff"
> class(test) ## 測試數據為字符 [1] "character"
2、按照指定分隔符拆分字符串
> a <- strsplit(test,split = " ") ##制動分隔符為空格進行拆分數據 > a [[1]] [1] "aa" "bb" "cc" "dd" "ee" "ff"
> class(a) ## 分割后的數據類型為列表 [1] "list"
> b <- strsplit(test,split = "") ## 分隔符設為空，則拆分每一個字符 > b [[1]] [1] "a" "a" " " "b" "b" " " "c" "c" " " "d" "d" " " "e" "e" " " "f" [17] "f"
> test <- "aa,bb,cc,dd,ee!ff!GG" ##重新創建測試數據
> strsplit(test,split = ",") ##指定分隔符為","進行拆分 [[1]] [1] "aa" "bb" "cc" "dd" "ee!ff!GG"
> strsplit(test,split = "!") ##指定分隔符為"!"進行拆分 [[1]] [1] "aa,bb,cc,dd,ee" "ff" "GG"
> test <- "aa\\sbb\\scc\\sdd\\see\\sff" ##重新創建測試數據
> strsplit(test,split = "\\s") ##指定分隔符"\\s"進行拆分，未起作用 [[1]] [1] "aa\\sbb\\scc\\sdd\\see\\sff"
> strsplit(test,split = "\\s",fixed = T) ##設置fixed = T,正常拆分，參數作用為精確匹配，屏蔽正則表達式 [[1]] [1] "aa" "bb" "cc" "dd" "ee" "ff"
> test <- "aa.bb.cc.dd.ee" ##同上
> strsplit(test,split = ".") [[1]] [1] "" "" "" "" "" "" "" "" "" "" "" "" "" ""
> strsplit(test,split = ".",fixed = T) [[1]] [1] "aa" "bb" "cc" "dd" "ee"
3、指定輸出結果為向量
> test <- "aa,bb,cc,dd,ee" ##生產測試數據
> a <- strsplit(test,split = ",") > a [[1]] [1] "aa" "bb" "cc" "dd" "ee"
> class(a) [1] "list"
> b <- unlist(strsplit(test,split = ",")) ## 加unlist函數 > b [1] "aa" "bb" "cc" "dd" "ee"
> class(b) [1] "character"