在字符串列表中查找单词 [英] Find the words in list of strings

问题描述

我有

words <- c("word1", "word")
text <- c("this is word1", "this is word2", "this is word4")

如果我使用 sapply(words, grepl, text) 给你 TRUE 和 FALSE 的答案，相反，我如何获得匹配的确切单词所以答案是

If I use sapply(words, grepl, text) gives you answer in TRUE and FALSE, instead how can I get the exact words that has matched such that the answer would be

"this is word1"

我是 R 新手，请原谅我提出这样愚蠢的问题.欢迎提出任何想法.

I being new to R pardon for such silly question. Any ideas are welcome.

推荐答案

一种选择是创建词边界，然后使用 grep 来避免任何字符串的部分匹配和 value =TRUE，它返回字符串而不是索引

One option would be to create word boundary and then use grep to avoid any partial matching of strings and with value = TRUE, it returns the string instead of the index

grep(paste0("\\b(", paste(words, collapse="|"), ")\\b"), text, value = TRUE)
#[1] "this is word1"

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