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A general description is here.
New function ‘aregexec()’ in package ‘utils’ for finding the positions of approximate string matches as well as all substrings corresponding to parenthesized subexpressions of the given regular expression.
‘R CMD check’ now gives an NOTE about S3 methods with their full name in the usage even if they are exported from a namespace: in almost all cases they are intended to be used only as methods and should use the ‘\method’ markup. In the other rare cases the recommended form is to use a function such as ‘coefHclust’ which would not get confused with a method, document that and register it in the ‘NAMESPACE’ file by ‘s3method(coef, hclust, coefHclust)’.