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havenwood/valid-ipv4.rb

Last active December 20, 2015 07:29
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Check IPV4 validity with a bit more particularity than IPAddr::RE_IPV4ADDRLIKE.
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valid-ipv4.rb
def ipv4? string
octets = string.split '.'
octets.size == 4 && octets.all? do |octet|
octet == octet.to_i.to_s(10) && (0..255).cover?(octet.to_i)
end
end
ipv4? '192.168.1.1'
#=> true
ipv4? '192.168.1.1.1'
#=> false
ipv4? '256.168.1.1'
#=> false
ipv4? '0x1.0x1.0x1.0x1'
#=> false
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