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Convert string to binary number

class String   def bin     val = self.strip     pattern = /^([+-]?)(0b)?([01]+)(.*)$/     parts = pattern.match(val)     return 0 if not parts     sign = parts[1]     num  = parts[3]     eval(sign+"0b"+num)   end end a = "10011001".bin b = "0b10011001".bin c = "0B1001001".bin d = "nothing".bin e = "0b100121001".bin