regex - Using R, how do I test a dataframe of phrases to see if it contains keywords -


i have 2 dataframes. 1 containing search phrases this

    search.phrases 1  quick 2  brown fox jumps 3  on lazy  5  dog 6  why 7  nobody knows    ...

and containing keywords

    keywords 1  quick 2  lazy  3  dog 4  knows    ...

ideally, want find search phrases contains 1 or more (either boolean or count) of the keywords 

    search.phrases      keyword.found      1  quick           true 2  brown fox jumps     false       3  on lazy       true 5  dog                 true 6  why                 false 7  nobody knows         true    ...

i've been trying while i'm stumped. appreciated.

lots of love

g

you can use grepl()

rgx <- paste(as.character(df2$keywords), collapse = "|") df$keyword.found <- grepl(rgx, df$search.phrases)

result:

   search.phrases keyword.found 1       quick          true 2 brown fox jumps         false 3   on lazy          true 5             dog          true 6             why         false 7    nobody knows          true

data:

df2 <- structure(list(keywords = structure(c(4l, 3l, 1l, 2l), .label = c("dog",  "knows", "lazy", "quick"), class = "factor")), .names = "keywords", class = "data.frame", row.names = c("1",  "2", "3", "4")) df <- structure(list(search.phrases = structure(c(5l, 1l, 4l, 2l, 6l,  3l), .label = c("brown fox jumps", "dog", "nobody knows", "over lazy",  "the quick", "why"), class = "factor")), .names = "search.phrases", class = "data.frame", row.names = c("1",  "2", "3", "5", "6", "7"))

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