带括号的 R grep 模式正则表达式 [英] R grep pattern regex with brackets

问题描述

我在 R 中使用 grep 时遇到问题:

I have a problem with grep in R:

patterns= c("AB_(1)","AB_(2)")
text= c("AB_(1)","DDD","CC")

grep(patterns[1],text)
>integer(0)  ????

grep 命令的()"括号有问题，有没有我可以使用的 as.XX(patterns[1]) ??

the grep command has problem with "()" brackets, is there any as.XX(patterns[1]) that I can use??

推荐答案

你需要用双反斜杠转义:

You need escape by double backslash:

> patterns= c("AB_\\(1\\)","AB_(2)")
> text= c("AB_(1)","DDD","CC")
> 
> grep(patterns[1],text)
[1] 1

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