在R的字符串中的两个字母之间添加空格 [英] Add space between two letters in a string in R

问题描述

假设我有一个像这样的字符串

Suppose I have a string like

s = "PleaseAddSpacesBetweenTheseWords"

我如何在R中使用gsub在单词之间添加一个空格，以便获得

How do I use gsub in R add a space between the words so that I get

"Please Add Spaces Between These Words"

我应该做类似的事情

gsub("[a-z][A-Z]", ???, s)

我要做什么??.另外，我发现R的正则表达式文档令人困惑，因此在R中对正则表达式的引用或撰写将不胜感激.

What do I put for ???. Also, I find the regular expression documentation for R confusing so a reference or writeup on regular expressions in R would be much appreciated.

推荐答案

您只需要捕获匹配项，然后使用\1语法引用捕获的匹配项即可.例如

You just need to capture the matches then use the \1 syntax to refer to the captured matches. For example

s = "PleaseAddSpacesBetweenTheseWords"
gsub("([a-z])([A-Z])", "\\1 \\2", s)
# [1] "Please Add Spaces Between These Words"

当然，这只是在每个小写/大写字母配对之间放置了一个空格.它不知道什么是真正的单词".

Of course, this just puts a space between each lower-case/upper-case letter pairings. It doesn't know what a real "word" is.

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