859dc1fda8
Notable changes:
- str_match_all() now returns NA if an optional group doesn't match
(previously it returned ""). This is more consistent with
str_match() and other match failures.
- In str_replace(), replacement can now be a function that is called
once for each match and who's return value is used to replace the
match.
- New str_which() mimics grep().
- A new vignette (vignette("regular-expressions")) describes the
details of the regular expressions supported by stringr. The main
vignette (vignette("stringr")) has been updated to give a high-level
overview of the package.
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