regex - 如何使用删除字符向量内单词之间的多余空白？

Question

假设我有一个像这样的字符 vector

"Hi,  this is a   good  time to   start working   together.". 

我只想有

" Hi, this is a good time to start working together." 

两个字之间只有一个空格。我应该如何在R中执行此操作？

Answer 1

gsub是您的 friend :

test <- "Hi,  this is a   good  time to   start working   together."
gsub("\\s+"," ",test)
#[1] "Hi, this is a good time to start working together."

\\s+将匹配任何空格字符(空格，制表符等)或空格字符的重复，并将其替换为单个空格 " "。