Anchors

suppressPackageStartupMessages(library("tidyverse"))

package 㤼㸱tidyverse㤼㸲 was built under R version 3.6.3

1. How would you match the literal string “\(^\)”?

To check that the pattern works, I’ll include both the string “\(^\)”, and an example where that pattern occurs in the middle of the string which should not be matched.

str_view(c("$^$", "ab$^$sfas"), "^\\$\\^\\$$", match = TRUE)

Registered S3 methods overwritten by 'htmltools':
  method               from         
  print.html           tools:rstudio
  print.shiny.tag      tools:rstudio
  print.shiny.tag.list tools:rstudio
Registered S3 method overwritten by 'htmlwidgets':
  method           from         
  print.htmlwidget tools:rstudio

2. Given the corpus of common words in stringr::words, create regular expressions that find all words that:

Since this list is long, you might want to use the match argument to str_view() to show only the matching or non-matching words.

1. The words that start with “y” are:

str_view(stringr::words, "^y", match = TRUE)

2. End with “x”

str_view(stringr::words, "x$", match = TRUE)

3. Are exactly three letters long are

str_view(stringr::words, "^...$", match = TRUE)

4. The words that have seven letters or more are

str_view(stringr::words, ".......", match = TRUE)