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Created page with "local p = {} function p._isIpV6(s) local dcolon, groups if type(s) ~= "string" or s:len() == 0 or s:find("[^:%x]") -- only colon and hex digits are legal chars or s:find("^:[^:]") -- can begin or end with :: but not with single : or s:find("[^:]:$") or s:find(":::") then return false end s, dcolon = s:gsub("::", ":") if dcolon > 1 then return false end -- at most one :: s = s:gsub("^:?", ":") -- prepend : if needed, upper s, groups = s:gsub(":%x%x?%x..."