Delete first n lines of a string

del_first_lines.lua

function del_first_lines(astring, n)
    -- parameters: string and number of initial lines to be deleted
    local result = ""
    local deleted = n
    local newfirst = true
    for line in astring:gmatch("[^\r\n]+") do
        if deleted > 0 then
            deleted = deleted - 1
        else
            if newfirst then
                result = result .. line
                newfirst = false
            else
                result = result .. "\n" .. line
            end
        end
    end
    return result
end