From: Thomas Wieczorek <wieczo.yo@...>
Date: 2008-02-08T18:55:30+09:00
Subject: Re: convert String to range

I tried to monkey patch the Range class, but it doesn't seem to work,
so I patched the String class:

class String
    def to_range
        case self.count('.')
            when 2
                elements = self.split('..')
                return Range.new(elements[0].to_i, elements[1].to_i)
            when 3
                elements = self.split('...')
                return Range.new(elements[0].to_i, elements[1].to_i-1)
            else
                raise ArgumentError.new("Couldn't convert to Range: #{str}")
        end
    end
end

p "1..2".to_range
p "1...2".to_range
p "1.2".to_range

output:
1..2
1..1
rng.test:11:in `to_range': undefined local variable or method `str'
for "1.2":String (NameError)
	from rng.test:18