regex - 如何对包含给定单词的句子向量进行子集化

Question

假设我有一个句子向量:

Vector
Juan is searching for a magazine.
Julia searched her car.
Go to the market to buy eggs.
Your name is unsearchable.
Search for me when you get to Paris.
Can you search for a low cost solution?

我想要这个向量的一个子集，它只包含带有单词“search”或其变体(即已搜索、不可搜索、搜索)的条目。在 excel 中，我可能会使用类似 ISNUMBER(SEARCH("search",A1)) 的方法来找出 A1 列中哪些单元格包含单词“search”。

在我看来，grep 可能是我正在寻找的功能，但我不知道如何适本地使用它。

Answer 1

如果 vector 是您指定的 vertor:

> grep("search", vector, ignore.case=TRUE)
[1] 1 2 4 5 6
> vector[grep("search", vector, ignore.case=TRUE)]
[1] "Juan is searching for a magazine."      
[2] "Julia searched her car."                
[3] "Your name is unsearchable."             
[4] "Search for me when you get to Paris."   
[5] "Can you search for a low cost solution?"