stringr 1.6.0

Breaking changes

• All relevant stringr functions now preserve names (@jonovik, #575).
• str_like(ignore_case) is deprecated, with str_like() now always case sensitive to better follow the conventions of the SQL LIKE operator (@edward-burn, #543).
• In str_replace_all(), a replacement function now receives all values in a single vector. This radically improves performance at the cost of breaking some existing uses (#462).

New features

• New vignette("locale-sensitive") about locale sensitive functions (@kylieainslie, #404)
• New str_ilike() that follows the conventions of the SQL ILIKE operator (@edward-burn, #543).
• New str_to_camel(), str_to_snake(), and str_to_kebab() for changing "programming" case (@librill, #573 + @arnaudgallou, #593).

Minor bug fies and improvements

• str_* now errors if pattern includes any NAs (@nash-delcamp-slp, #546).
• str_dup() gains a sep argument so you can add a separator between every repeated value (@edward-burn, #564).
• str_sub<- now gives a more informative error if value is not the correct length.
• str_view() displays a message when called with a zero-length character vector (@LouisMPenrod, #497).
• New [[.stringr_pattern method to match existing [.stringr_pattern (@edward-burn, #569).