R - 替换正则表达式匹配的最后一个实例以及之后的所有内容 [英] R - replace last instance of a regex match and everything afterwards

问题描述

我正在尝试使用正则表达式来替换短语的最后一个实例(以及该短语之后的所有内容，可以是任何字符):

I'm trying to use a regex to replace the last instance of a phrase (and everything after that phrase, which could be any character):

stringi::stri_replace_last_regex("_AB:C-_ABCDEF_ABC:45_ABC:454:", "_ABC.*$", "CBA")

但是，我似乎无法让 refex 正常运行:

However, I can't seem to get the refex to function properly:

Input: "_AB:C-_ABCDEF_ABC:45_ABC:454:"
Actual output: "_AB:C-CBA"
Desired output: "_AB:C-_ABCDEF_ABC:45_CBA"

我也试过 gsub() 但没有奏效.

I have tried gsub() as well but that hasn't worked.

有什么想法我哪里出错了吗?

Any ideas where I'm going wrong?

推荐答案

一种解决方案是:

sub("(.*)_ABC.*", "\\1_CBA", Input)
[1] "_AB:C-_ABCDEF_ABC:45_CBA"

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