function split(s, plain_sep)
    local stringtable = {}
    local start = 1
    local found = string.find(s, plain_sep, start)
    while found ~= nil do
        table.insert(stringtable, string.sub(s, start, found - 1))
        start = found + string.len(plain_sep)
        found = string.find(s, plain_sep, start)
    end
    if start <= string.len(s) then
        table.insert(stringtable, string.sub(s, start))
    end
    return stringtable
end