# File lib/rbot/config.rb, line 104
    def validate(val, validator  = @validate)
      case validator
      when false, nil
        return true
      when Proc
        return validator.call(val)
      when Regexp
        raise ArgumentError, "validation via Regexp only supported for strings!" unless String === val
        return validator.match(val)
      else
        raise ArgumentError, "validation type #{validator.class} not supported"
      end
    end