R Under development (unstable) (2023-11-08 r85496 ucrt) -- "Unsuffered Consequences"
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> ##
> ##  s t r i n g s . R  tests
> ##
> 
> strcat <- pracma::strcat
> strcmp <- pracma::strcmp
> strcmpi <- pracma::strcmpi
> 
> strcmp(" empty", " empty")               # T
[1] TRUE
> !strcmp("empty ", "empty")               # F
[1] TRUE
> !strcmp("foobar", "barfoo")              # F
[1] TRUE
> !strcmp("string", "String")              # F
[1] TRUE
> !strcmp(c("yes", "no"), c("yes", "on"))  # F
[1] TRUE
> !strcmp(c("abc", "abc"), c("abc"))       # F
[1] TRUE
> strcmp(c("yes", "no"), c("yes", "no"))   # T
[1] TRUE
> 
> strcmpi("string", "String")              # T
[1] TRUE
> strcmpi(c("yes", "no"), c("Yes", "No"))  # T
[1] TRUE
> 
> blanks <- pracma::blanks
> deblank <- pracma::deblank
> strTrim <- pracma::strTrim
> strjust <- pracma::strjust
> strRep <- pracma::strRep
> 
> identical(c(blanks(0), blanks(1), blanks(2)), c("", " ", "  "))
[1] TRUE
> s <- c("  abc", "abc   ", " abc ", " a b c ", "abc", "a b c")
> identical(deblank(s), c("  abc", "abc", " abc", " a b c", "abc", "a b c"))
[1] TRUE
> identical(strTrim(s), c("abc", "abc", "abc", "a b c", "abc", "a b c"))
[1] TRUE
> identical(strjust(s, justify = "center"),
+           c(" abc ", " abc ", " abc ", "a b c", " abc ", "a b c"))
[1] TRUE
> s <- c('This is a good example.', "He has a good character.",
+        'This is good, good food.', "How goodgood this is!")
> identical(strRep(s, 'good', 'great'),
+           c('This is a great example.', "He has a great character.",
+             'This is great, great food.', "How greatgreat this is!"))
[1] TRUE
> 
> proc.time()
   user  system elapsed 
   0.06    0.10    0.15