R正则表达式删除除撇号以外的所有标点符号 [英] R regex remove all punctuation except apostrophe

问题描述

我正在尝试从字符串中删除除撇号以外的所有标点符号.这是我的 exastr2 <-

I'm trying to remove all punctuation from a string except apostrophes. Here's my exastr2 <-

str2 <- "this doesn't not have an apostrophe,.!@#$%^&*()"
gsub("[[:punct:,^\\']]"," ", str2 )
# [1] "this doesn't not have an apostrophe,.!@#$%^&*()"

我做错了什么?

推荐答案

否定先行断言"可用于在任何撇号被测试为标点符号之前从考虑中删除它们.

A "negative lookahead assertion" can be used to remove from consideration any apostrophes, before they are even tested for being punctuation characters.

gsub("(?!')[[:punct:]]", "", str2, perl=TRUE)
# [1] "this doesn't not have an apostrophe"

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