Utilities for Strings and Function Arguments
Description
The gsubfn function is like gsub but can take a replacement
function or certain other objects instead of the replacement string.
Matches and back references are input to the replacement function and
replaced by the function output. gsubfn can be used to split strings
based on content rather than delimiters and for quasi-perl-style string
interpolation. The package also has facilities for translating formulas
to functions and allowing such formulas in function calls instead of
functions. This can be used with R functions such as apply, sapply,
lapply, optim, integrate, xyplot, Filter and any other function that
expects another function as an input argument or functions like cat
or sql calls that may involve strings where substitution is desirable.
There is also a facility for returning multiple objects from functions
and a version of transform that allows the RHS to refer to LHS used in
the same transform.