class String

# File lib/to_range/string.rb, line 5
def to_range
  str = scan(/\d+\.{2,3}\d+/).first
  if str
    dots = str.count('.')
  else
    raise StringToRangeConversionFailed
  end
  three_dots = (dots == 3)
  arr = three_dots ? str.split('...') : str.split('..')
  first = arr.first.to_i
  last = arr.last.to_i
  three_dots ? first...last : first..last
end