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A general description is here.
Basic regular expressions (extended = FALSE) are defunct in , and strsplit(), grep and friends(), grepl(), sub(), gsub(), regexpr() and gregexpr() no longer have an 'extended' argument.
The 'extended' argument is deprecated in strsplit(), grep(), grepl(), sub(), gsub(), regexpr() and gregexpr() (not just the value extended = FALSE) and will be removed in R 2.11.0.
trigamma(x) and other psigamma(x, n) calls are now accurate also for very large abs(x). (PR#14020)
