stringr 1.1.0

2016-08-24

This release is mostly bug fixes, but there are a couple of new features you might care out.

• There are three new datasets, fruit, words and sentences, to help you practice your regular expression skills:

  str_subset(fruit, "(..)\\1")
  #> [1] "banana"      "coconut"     "cucumber"    "jujube"      "papaya"     
  #> [6] "salal berry"
  head(words)
  #> [1] "a"        "able"     "about"    "absolute" "accept"   "account"
  sentences[1]
  #> [1] "The birch canoe slid on the smooth planks."

• More functions work with boundary(): str_detect() and str_subset() can detect boundaries, and str_extract() and str_extract_all() pull out the components between boundaries. This is particularly useful if you want to extract logical constructs like words or sentences.

  x <- "This is harder than you might expect, e.g. punctuation!"
  x %>% str_extract_all(boundary("word")) %>% .[[1]]
  #> [1] "This"        "is"          "harder"      "than"        "you"        
  #> [6] "might"       "expect"      "e.g"         "punctuation"
  x %>% str_extract(boundary("sentence"))
  #> [1] "This is harder than you might expect, e.g. punctuation!"

• str_view() and str_view_all() create HTML widgets that display regular expression matches. This is particularly useful for teaching.