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Julia has a Sockets library as a builtin, which has the types IPv4 and IPv6 for single IP addresses.
<lang julia>using Sockets
function canonCIDR(cidr::String)
cidr = replace(cidr, r"\.(\.|\/)" => s".0\1") # handle ..
cidr = replace(cidr, r"\.(\.|\/)" => s".0\1") # handle ...
ip = split(cidr, "/")
dig = length(ip) > 1 ? 2^(32 - parse(UInt8, ip[2])) : 1
ip4 = IPv4(UInt64(IPv4(ip[1])) & (0xffffffff - dig + 1))
return length(ip) == 1 ? "$ip4" : "$ip4/$(ip[2])"
end
println(canonCIDR("87.70.141.1/22"))
println(canonCIDR("100.68.0.18/18"))
println(canonCIDR("10.4.30.77/30"))
println(canonCIDR("110.200.21/4"))
println(canonCIDR("10..55/8"))
println(canonCIDR("10.../8"))
</lang>{{out}}
<pre>
using Sockets
function canonCIDR(cidr::String)
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