From: Dmitry Buzdin <buzdin@...>
Date: 2006-11-17T23:30:06+09:00
Subject: Re: Newbie issue

Check the manual

str[0] will return a numeric representation of the character
what You need is str[0,1] one character starting from the first
position.

Try this:

 class String
 	def variantes
 		@variantes = 0
 		Range.new(0, 14).each { |i|
 			if (self[i,1] == "2" || self[i,1] == "X")
 				@variantes = @variantes + 1
 			end
 		}
 		return @variantes
 	end
 end
 
str = "XXXXX22222XXXXX"
puts str.variantes

Dmitry