trim_anything(string, pattern, side = "both")A string.
A string. The pattern to be trimmed (not interpreted as
regular expression). So to trim a period, use char = "." and not
char = "\\.").
Which side do you want to trim from? "both" is the
default, but you can also have just either "left" or "right"
(or optionally the shortened "b", "l" and "r").