local file=io.open("/sdcard/zhanghao.txt","r");
file:read("*a");
local data={};
file:close();
for i=1,#data do
if data[i]==A1 then
ile = io.open("/sdcard/zhuzhanghao.txt", "w");
file:write(i);
file:close();
end
end
注：读取zhanghao文本里的全部内容赋予数组，并查data数组里有没有A1。如果找到把A1写到zhuzhanghao文本里

zhanghao.txt里的内容：A1,B2,C3