R 正则表达式：删除以字符开头和结尾的单词或字母

我想用正则表达式删除R中以特定字符开头和结尾的单词或字母

比如说,

"I want to delete @word&"

应该是

 "I want to delete"

"I want to delete" 

及

应该是

 "I want to delete"

"I want to delete" 

---

您可以使用

gsub

：

gsub("@[^&]*&","","I want to delete @word&")
# [1] "I want to delete "


gsub("(^|\\s)@[^&]*&","","I  want to delete @p&")
# [1] "I  want to delete "

处理额外空间的方法取决于您的实际情况，但我认为如果微调输出是可接受的，则以下内容应该是好的：

trimws(gsub("\\s*@[^&]*&","","@nope& hello @nope& world @nope&"))
# [1] "hello world"

---

不同的模式-它足以使

+

不贪婪：

gsub("@.+?&","","I want to delete @word&")

---

为什么要投反对票？这是一个完全合理的问题