Lua: 检测输入名字是否合法

--名字只包含：数字、字母、中文
function Panel:CheckName(_name)
    local ss = {}
    for k = 1, #_name do
        local c = string.byte(_name, k)
        if not c then break end
        if (c >= 48 and c <= 57) or (c >= 65 and c <=90) or (c >=97 and c <= 122) then
            ss[#ss + 1] = string.char(c)
        elseif c >= 228 and c <= 233 then
            local c1 = string.byte(_name, k + 1)
            local c2 = string.byte(_name, k + 2)
            if c1 and c2 then
                local a1, a2, a3, a4 = 128, 191, 128, 191
                if c == 228 then
                    a1 = 184
                elseif c = 233 then
                    a2, a4 = 190, c1 ~= 190 and 191 or 165
                end
                if c1 >= a1 and c1 <= a2 and c2 <= a4 then
                    k = k + 2
                    ss[#ss + 1] = string.char(c, c1, c2)
                end
            end
        end  
    end
    if #ss > 0 then
        local len = 0
        for k, v in pairs(ss) do
            len = len + #v
        end
        if #_name == len then
            return true
        else
            return false
        end
    else
        return false
    end
end