????????????????????
????1?????????????磺abc
????2?????????????磺123
????3??????????????
????4?????????????磺???????
????5??????????????
????6?????????????????
???????abc@sohucom
???????abc@.com
???????abc@sina com
???????abc@com
????7?? ?????????????????磺a@b.hello
????8??????????????????????????????????
????9????????????Check?????1.?????-???????????100????