/^\w+((-\w+)|(\.\w+))*\@[A-Za-z0-9]+((\.|-)[A-Za-z0-9]+)*\.[A-Za-z]+$/;

https://www.google.com/search?q=mysql_query(%22set+names+%27utf8%27%22)&rlz=1C1CHBD_zh-TWTW924TW924&oq=mysql_query(%22set+names+%27utf8%27%22)&aqs=chrome..69i57&sourceid=chrome&ie=UTF-8

https://chaneswin.pixnet.net/blog/post/29888852