点号作为分隔符推荐转义处理 “\.”
string="head.body.tail"> stringr::str_split(string = string,pattern = "\\.",simplify = T)[,1][1] "head"> stringr::str_split(string = string,pattern = "\\.",simplify = T)[,2][1] "body"> stringr::str_split(string = string,pattern = "\\.",simplify = T)[,3][1] "tail"
也可以使用字符类"[.]"
> stringr::str_split(string = string,pattern = "[.]",simplify = T)[,1] [,2] [,3] [1,] "head" "body" "tail"
