Added character groups for \d, \s, \w, etc.

Also added limiter to only display (currently, by default) the first 5
characters from ANY group, to prevent spam in the output
Only first 5 chars from each group are returned

E.g. \d = [0, 1, 2, 3, 4], and \w = ['a', 'b', 'c', 'd', 'e']
This prevents a crazy number of examples being returned!