12_Aabcdefgh@xxxxxxxxxxxxxxxxx.xx/sd_12  NO
12_Aabcdefgh@abc.                        NO
12_Aabcdefgh@abc._321Ad./                NO
aa/@                                     NO
aa@/ds                                   NO
aa@.sda/ds                               NO
aa@s.s./ds                               NO
aa@dsdsa.dsafsaa.fsaffas.fgafasfsafsafsa NO
aaA@dsa_3#dsa                            NO
aasdad@dsa$                              NO
dsa@dsa.xsa.ds/dsa#(sd                   NO


aa@s.s.s/ds                             YES
12_Aabcdefgh@abc._321Ad/ds_dsad         YES
12_Aabcdefgh@xxxxxxxxxxxxxxxx.xx        YES

从下午干到了晚上 我是蒟蒻无疑！！！！ 这些数据只是我的愚见，过不了的话，还是多看看题解吧