Other types of pattern

suppressPackageStartupMessages(library("tidyverse"))

package 㤼㸱tidyverse㤼㸲 was built under R version 3.6.3

1. How would you find all strings containing \ with regex() vs. with fixed()?

str_subset(c("a\\b", "ab"), "\\\\")

[1] "a\\b"

str_subset(c("a\\b", "ab"), fixed("\\"))

[1] "a\\b"

2. What are the five most common words in sentences?

Using str_extract_all() with the argument boundary("word") will extract all words. The rest of the code uses dplyr functions to count words and find the most common words.

tibble(word = unlist(str_extract_all(sentences, boundary("word")))) %>%
  mutate(word = str_to_lower(word)) %>%
  count(word, sort = TRUE) %>%
  head(5)