dplyover provides three kinds of selection helpers which are intended for
use in all functions that accept a vector as argument (that is over() and
crossover() as well as their variants, see here for a full list of the
over-across function family).
Helpers which select string parts of the column names (of the underyling data):
cut_names() removes a specified pattern.
extract_names() extracts a specified pattern.
Helpers which select values of a variable:
dist_values() returns all distinct values.
seq_range() returns the sequence between the range() of a variable.
A helper function that evaluates a glue specification as variable
.() evaluates an interpolated string as symbol