select_by_file_extension: Select string that end in a particular way (e.g. a certain file extension)
Description
Sometimes it makes sense to apply a function to several files in a folder, but only to
those of a particular file type. This function can selects all elements in a vector of strings
that end in a particular way, e.g. on a common file extension.
Usage
select_by_file_extension(strings, file_extension)
Arguments
strings
vector of character strings for elements to be extracted from.
file_extension
character string specifying the extension of the file type to be selected.
This can also be any other trailing string that marks all vector elements to be selected.
Value
subset of the strings vector that only contains the elements that end on file_extension.