R 从 str_split 获取最后一个元素 [英] R get last element from str_split

问题描述

我有一个 R 字符串列表，我想获取每个字符串的最后一个元素

I have a R list of strings and I want to get the last element of each

require(stringr)

string_thing <- "I_AM_STRING"
Split <- str_split(string_thing, "_")
Split[[1]][length(Split[[1]])]

但是我如何使用字符串列表来做到这一点?

but how can I do this with a list of strings?

require(stringr)

string_thing <- c("I_AM_STRING", "I_AM_ALSO_STRING_THING")
Split <- str_split(string_thing, "_")

#desired result
answer <- c("STRING", "THING")

谢谢

推荐答案

正如对您问题的评论所暗示的，这适用于 gsub:

As the comment on your question suggests, this is suitable for gsub:

gsub("^.*_", "", string_thing)

我建议您同时注意以下情况.

I'd recommend you take note of the following cases as well.

string_thing <- c("I_AM_STRING", "I_AM_ALSO_STRING_THING", "AM I ONE", "STRING_")
gsub("^.*_", "", string_thing)
[1] "STRING"   "THING"    "AM I ONE" ""  

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