lua DIY split函数

function split(val,delimiter)
    local matches = {}
    if val == nil or val == '' or val == 0 or val == false then
        table.insert(matches,nil)  -- #matches = 0
    elseif delimiter == '' then
        table.insert(matches,val)  -- #matches = 1
    else
        if not string.match(val,delimiter) then
            table.insert(matches,val)  -- #matches = 1
        else
            string.gsub(val,"[^"..delimiter.."]+",function(c) matches[#matches+1] = c end)  -- #matches = n
        end
    end                                                                                                                                
    return matches
end

欢迎debug，完善。