Convert string to upper case, lower case, title case, or sentence case — case • stringr

str_to_upper() converts to upper case.
str_to_lower() converts to lower case.
str_to_title() converts to title case, where only the first letter of each word is capitalized.
str_to_sentence() convert to sentence case, where only the first letter of sentence is capitalized.

Usage

str_to_upper(string, locale = "en")

str_to_lower(string, locale = "en")

str_to_title(string, locale = "en")

str_to_sentence(string, locale = "en")

Arguments

string: Input vector. Either a character vector, or something coercible to one.
locale: Locale to use for comparisons. See stringi::stri_locale_list() for all possible options. Defaults to "en" (English) to ensure that default behaviour is consistent across platforms.

Value

A character vector the same length as string.

Examples

dog <- "The quick brown dog"
str_to_upper(dog)
#> [1] "THE QUICK BROWN DOG"
str_to_lower(dog)
#> [1] "the quick brown dog"
str_to_title(dog)
#> [1] "The Quick Brown Dog"
str_to_sentence("the quick brown dog")
#> [1] "The quick brown dog"

# Locale matters!
str_to_upper("i") # English
#> [1] "I"
str_to_upper("i", "tr") # Turkish
#> [1] "İ"