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

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