Partial String Matching
charmatch seeks matches for the elements of its first argument
among those of its second.
charmatch(x, table, nomatch = NA_integer_)
Exact matches are preferred to partial matches (those where the value to be matched has an exact match to the initial part of the target, but the target is longer).
If there is a single exact match or no exact match and a unique
partial match then the index of the matching value is returned; if
multiple exact or multiple partial matches are found then
returned and if no match is found then
nomatch is returned.
NA values are treated as the string constant
An integer vector of the same length as x, giving the
indices of the elements in table which matched, or nomatch.
charmatch("", "") # returns 1 charmatch("m", c("mean", "median", "mode")) # returns 0 charmatch("med", c("mean", "median", "mode")) # returns 2