R:如何更换.在字符串中? [英] R: How to replace . in a string?

问题描述

我有一个字符串说a.b"，我想替换."和 "_".

I have a string say "a.b" and I want to replace "." with "_".

gsub(".","_","a.b")

不能作为 .匹配所有字符.

doesn't work as . matches all characters.

gsub("\.","_","a.b")

只是给我一个错误.

阅读有关 ?gsub 的文档没有多大帮助！

Reading the documentation on ?gsub is not that helpful!

那么如何做这件直截了当的事情?

So how to do this straight-forward thing?

推荐答案

. 匹配任何字符.转义 . 使用 \ 匹配 . 字面意义.

. matches any character. Escape . using \ to match . literally.

\ 本身也是应该转义的:

\ itself is also should be escaped:

> gsub("\\.", "_", "a.b")
[1] "a_b"

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