lua字符串分割

function string_split(s,delim)
local start = 1;
local t = {};

while true do
local pos = string.find (s, delim, start, true)
if not pos then      break    end
table.insert (t, string.sub (s, start, pos - 1))
start = pos + string.len (delim)
end

table.insert (t, string.sub (s, start))
return t;
end