Week 9: Strings and regular expressions

DATA 412/612 · October 28

Lectures

• 9.1 stringr: Strings(PDF)
• 9.2 stringr: Regular Expressions(PDF)
• stringr cheat sheet (Posit)

Labs

• Lab 9: Strings and Regex(PDF)
• Lab 9 solutions (password)

Sample quiz

• Quiz 2, sample 1(PDF)
• Quiz 2, sample 2(PDF)

Additional readings

• R for Data Science: Strings
• R for Data Science: Regular expressions
• stringr documentation
• STAT 545: Character vectors

Discussion

• Why is str_detect() often easier to use in a tidy pipeline than grepl()?
• In words, write a pattern that finds a DC ZIP code. What would that pattern miss?