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rextractuppercase

Remove words that start with uppercase

How do I remove all words that begin with a capital letter from a dataset?

For example:

d <- c("nice", "cat", "Cat", "Dog")

should result in c("nice", "cat")

(Yes, I looked online for a very long time before asking this question. I'm sure the answer is simple, but I cannot figure out the regex syntax for it.)

Solution

  • Find (grep) words that start (^) with upper-case letter ([A-Z]), but return everything else (invert = TRUE)

    grep("^[A-Z]", c("nice", "cat", "Cat", "Dog"), invert = TRUE, value = TRUE)
# [1] "nice" "cat"