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我试图从R中的句子中提取精确的短语。它也提取了其部分匹配的句子。例如:无法从R中的句子中提取精确的短语
phrase <- c("r is not working","roster is not working")
sentence <- c("ABC is not working and roster is not working","CDE is working but printer is not working")
extract <- sapply(phrase, grepl, x = sentence)
extract
它使输出为:
r is not working roster is not working
[1,] TRUE TRUE
[2,] TRUE FALSE
我所需的输出是:
r is not working roster is not working
[1,] FALSE TRUE
[2,] FALSE FALSE
短语 “R不工作” 不应该匹配两个句子。有什么办法可以解决这个问题吗?有什么想法吗?谢谢!!
可能会添加字边界,如'sapply(paste0(“\\ b”,短语,“\\ b”),grepl,x =句子)' –
“r不工作”匹配两个字符串,但添加一个空格在r:“r不工作”之前将阻止匹配。 – Dave2e