findstr /r "http.*mp3" web.txt>>mp3.txtfindstr /c:"http.*mp3" web.txt>>mp3.txt 参数/c指把"http.*mp3"当字符串findstr /r "http.*mp3" web.txt>>mp3.txt 参数/r指一般表达式.*代表任意字符
find /i "http://" web.txt | find /i ".mp3" web.txt >> mp3.txt @pause