char_tolower
and char_toupper
are replacements for
base::tolower() and base::tolower()
based on the stringi package. The stringi functions for case
conversion are superior to the base functions because they correctly
handle case conversion for Unicode. In addition, the *_tolower()
functions
provide an option for preserving acronyms.
char_tolower(x, keep_acronyms = FALSE) char_toupper(x)
x | the input object whose character/tokens/feature elements will be case-converted |
---|---|
keep_acronyms | logical; if |
txt1 <- c(txt1 = "b A A", txt2 = "C C a b B") char_tolower(txt1) #> txt1 txt2 #> "b a a" "c c a b b" char_toupper(txt1) #> txt1 txt2 #> "B A A" "C C A B B" # with acronym preservation txt2 <- c(text1 = "England and France are members of NATO and UNESCO", text2 = "NASA sent a rocket into space.") char_tolower(txt2) #> text1 #> "england and france are members of nato and unesco" #> text2 #> "nasa sent a rocket into space." char_tolower(txt2, keep_acronyms = TRUE) #> text1 #> "england and france are members of NATO and UNESCO" #> text2 #> "NASA sent a rocket into space." char_toupper(txt2) #> text1 #> "ENGLAND AND FRANCE ARE MEMBERS OF NATO AND UNESCO" #> text2 #> "NASA SENT A ROCKET INTO SPACE."