Digits, words and spaces

So far in your life you might have always searched for one number or word exactly. Now you have a much more flexible tool at hand, to search for:

\\d digits (zero to nine)
\\w word characters (letters, numbers or underscores)
\\s white spaces (also tabs and line breaks)

Plus, you can use square brackets [A-Za-z] and have a list of possible values inside.

You already found all sequels of "Saw". Can you create a pattern that matches all sequels in the list movie_titles? They usually have a number at the end, right?

Furthermore, the list contains duplicates introduced by "Grey" (British) and "Gray" (American English). Create a pattern that matches both versions of the color.

Lastly, list out all movie titles that contain special, non word characters.

Diese Übung ist Teil des Kurses

Intermediate Regular Expressions in R

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Anleitung zur Übung

Match all movies titles that end with a space followed by a digit.
Match both "Grey" and "Gray" with a custom pattern […].
Write a pattern that matches everything but word characters \\w and spaces \\s.

Interaktive Übung

Versuche dich an dieser Übung, indem du diesen Beispielcode vervollständigst.

# List all movies that end with a space and a digit
movie_titles[str_detect(movie_titles,
  pattern = "___"
)]

# List all movies that contain "Grey" or "Gray"
movie_titles[str_detect(movie_titles,
  pattern = "Gr___y"
)]

# List all movies with strange characters (no word or space)
movie_titles[str_detect(movie_titles,
  pattern = "[___]"
)]

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