Unicode and pattern matching

String Manipulation with stringr in R

Charlotte Wickham

Assistant Professor at Oregon State University

Unicode

• Associates each character with a code point

Character	Code point

Unicode

• Associates each character with a code point

Character	Code point
a	61

Unicode

• Associates each character with a code point

Character	Code point
a	61
μ	3BC

Unicode

• Associates each character with a code point

Character	Code point
a	61
μ	3BC
	1F600

Unicode in R

"\u03BC"

μ

"\U03BC"

μ

writeLines("\U0001F44F")

👏

Unicode in R

Matching Unicode

• http://unicode.org/charts

• http://www.fileformat.info/info/unicode/char/search.htm

Matching Unicode groups

• Regular expression
  • Use \p followed by {name}
• rebus
  • str_view_all(x, greek_and_coptic())

• ?Unicode
• ?unicode_property
• ?unicode_general_category

Let's practice!

String Manipulation with stringr in R