This function takes a character vector with regular expressions, a numeric vector with numeric indices, or a logical vector that is either as long as the source or has length 1; and then always returns a logical vector of the same length as the source.
Arguments
- source
The source to produce the filter for.
- filter
THe filtering criterion: a character vector with regular expressions, a numeric vector with numeric indices, or a logical vector that is either as long as the source or has length 1.
- ignore.case
Whether to apply the regular expression case sensitively or not (see
base::grepl()
).- invert
Whether to invert the result or not (i.e. whether the filter specifies what you want to select (
invert=FALSE
) or what you don't want to select (invert=TRUE
)).- perl
Whether the regular expression (if
filter
is a character vector) is a perl regular expression or not (seebase::grepl()
).- ...
Any additional arguments are passed on to
base::grepl()
.