class Regexp::Expression::CharacterSet::Range
def <<(exp)
def <<(exp) complete? && raise("Can't add more than 2 expressions to a Range") super end
def complete?
def complete? count == 2 end
def starts_at
def starts_at expressions.first.starts_at end
def to_s(_format = :full)
def to_s(_format = :full) expressions.join(text) end