stringr

I'm trying to combine dplyr and stringr to detect multiple patterns in a dataframe. I want to use dplyr as I want to test a number of different columns. Here's some sample data: test.data <- data.frame(item = c("Apple", "Bear", "Orange", "Pear", "Two Apples")) fruit <- c("Apple", "Orange", "Pear") test.data item 1 Apple 2 Bear 3 Orange 4 Pear 5 Two Apples What I would like to use is something like: test.data <- test.data %>% mutate(is.fruit = str_detect(item, fruit)) and receive item is.fruit 1 Apple 1 2 Bear 0 3 Orange 1 4 Pear 1 5 Two Apples 1 A very simple test works > str_detect("Apple",

I am trying to find a simple way to extract an unknown substring (could be anything) that appear between two known substrings. For example, I have a string: a<-" anything goes here, STR1 GET_ME STR2, anything goes here" I need to extract the string GET_ME which is between STR1 and STR2 (without the white spaces). I am trying str_extract(a, "STR1 (.+) STR2") , but I am getting the entire match [1] "STR1 GET_ME STR2" I can of course strip the known strings, to isolate the substring I need, but I think there should be a cleaner way to do it by using a correct regular expression. You may use str

I have a data frame with two columns: df = data.frame(animals = c("cat; dog; bird", "dog; bird", "bird"), sentences = c("the cat is brown; the dog is barking; the bird is green and blue","the dog is black; the bird is yellow and blue", "the bird is blue"), stringsAsFactors = F) I'd need the sum of the occurrences of all the "animals" on each row in the entire "sentences" column. For example: "animals" first row c("cat; dog; bird") = sum_occurrences_sentences_column (cat = 1) + (dog = 2) + (bird = 3) = 6 . The result will be a third column like this: df <- cbind( sum_accurrences_sentences

Given a string, mystr = "Average student score 88" I wish to split if there are more than 1 space. I wish to obtain the following: "Average student score" "88" I searched that "\s+" will split by any number of spaces. strsplit(mystr, "\\s+") But this is not what I want. Is there any option within strsplit that can split strings based on a certain number of spaces (say space = k) or a rule on spaces (say space > 1)? Avinash Raj You may specify it through a repetition quantifier. strsplit(mystr, "\\s{2,}") \\s{2,} regex should match two or more spaces. 来源： https://stackoverflow.com/questions