Lua自己实现string.split功能

local function split(str, d) --str是需要查分的对象 d是分界符
	local lst = { }
	local n = string.len(str)--长度
	local start = 1
	while start <= n do
		local i = string.find(str, d, start) -- find 'next' 0
		if i == nil then 
			table.insert(lst, string.sub(str, start, n))
			break 
		end
		table.insert(lst, string.sub(str, start, i-1))
		if i == n then
			table.insert(lst, "")
			break
		end
		start = i + 1
	end
	return lst
end

另一种：用指定字符或字符串分割输入字符串，返回包含分割结果的数组：

function string.split(input, delimiter)
    input = tostring(input)
    delimiter = tostring(delimiter)
    if (delimiter=='') then return false end
    local pos,arr = 0, {}
    -- for each divider found
    for st,sp in function() return string.find(input, delimiter, pos, true) end do
        table.insert(arr, string.sub(input, pos, st - 1))
        pos = sp + 1
    end
    table.insert(arr, string.sub(input, pos))
    return arr
end