iptest.rb

module IpTest
  module V4
    MAX_LEN = '255.255.255.255'.size
    SEGMENT = /(?:25[0-5]|(?:2[0-4]|1?[0-9])?[0-9])/
    PATTERN = /#{SEGMENT}\.#{SEGMENT}\.#{SEGMENT}\.#{SEGMENT}/
    PATTERN_ANCHORED = /\A#{PATTERN}\z/

    def self.contains?(str)
      PATTERN.match?(str)
    end

    def self.match?(str)
      str.size <= MAX_LEN && PATTERN_ANCHORED.match?(str)
    end
  end

  module V6
    MAX_LEN = 'ffff:ffff:ffff:ffff:ffff:ffff.255.255.255.255'.size
    FILTER = /\A[0-9a-fA-F:\.]{2,45}\z/
    SEGMENT = /[0-9a-fA-F]{1,4}/
    PATTERN_8HEX = /(?:#{SEGMENT}:){7}#{SEGMENT}/
    PATTERN_COMPRESSED = /(?:#{SEGMENT}(?::#{SEGMENT}){0,7})?::(?:#{SEGMENT}(?::#{SEGMENT}){0,7})?/
    PATTERN_6HEX4DEC = /(?:#{SEGMENT}:#{SEGMENT}:#{SEGMENT}:#{SEGMENT}:#{SEGMENT}:#{SEGMENT}:#{SEGMENT}):#{V4::PATTERN}/
    PATTERN_6HEX4DEC_COMPRESSED = /(?:#{SEGMENT}(?::#{SEGMENT}){1,4})?::(?:#{SEGMENT}(?::#{SEGMENT}){1,4})?:#{V4::PATTERN}/
    PATTERN = /#{PATTERN_8HEX}|#{PATTERN_COMPRESSED}|#{PATTERN_6HEX4DEC}|#{PATTERN_6HEX4DEC_COMPRESSED}/
    PATTERN_ANCHORED = /\A(?:#{PATTERN})\z/

    def self.contains?(str)
      PATTERN.match?(str)
    end

    def self.match?(str)
      str.size <= MAX_LEN && FILTER.match?(str) && PATTERN_ANCHORED.match?(str)
    end
  end

  def self.contains?(str)
    V4.contains?(str) || V6.contains?(str)
  end

  def self.match?(str)
    V4.match?(str) || V6.match?(str)
  end
end