R - 从句子中删除单词

Question

我在 R 中有一个向量，它在向量的最后一个索引处有一个单词列表。我需要从该列表中删除一些单词

sentence <- "This is a sample sentence with words like or to be removed"
wordsToRemove <- c("The","an", "very", "of", "or","in","a","uses","that","be")

splitSent <- strsplit(sentence, " ")

我尝试了wordsToRemove %in% list(splitSent)，但这一切都是错误的。有没有其他办法处理？

注意：这句话是我的向量中的一个元素，它有 int，其他数据类型也是如此。我已经通过下面的链接 R: find vector in list of vectors

Answer 1

我们可以尝试在此处使用sub 和正则表达式替换来涵盖您的所有条款。这个答案通过搜索以下正则表达式，然后用空字符串替换它来有效地删除它：

\s*\b(The|an|very|of|or|in|a|uses|that|be)\b

这将匹配您的任何条款，以及任意数量的前导空格。

sentence <- "This is a sample sentence with words like or to be removed"
sentence
wordsToRemove <- c("The","an", "very", "of", "or","in","a","uses","that","be")

regex <- paste0("\\s*\\b(", paste(wordsToRemove, collapse="|"), ")\\b")
output <- sub("^\\s+", "", gsub(regex, "", sentence, ignore.case=TRUE))
output

[1] "This is a sample sentence with words like or to be removed"
[1] "This is sample sentence with words like to removed"

请注意，我实际上对上面的sub 进行了额外调用，因为我们必须修剪模式可能遗漏的任何初始前导空格。