正则表达式解析网站：
https://jex.im/regulex/#!flags=&re=%5E(%5BA-Za-z0-9_%5C-%5C.%5D)%2B%5C%40(%5BA-Za-z0-9_%5C-%5C.%5D)%2B%5C.(%5BA-Za-z%5D%7B2%2C%7D)%24
正则表达式解析
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正则表达式解析网站：
https://jex.im/regulex/#!flags=&re=%5E(%5BA-Za-z0-9_%5C-%5C.%5D)%2B%5C%40(%5BA-Za-z0-9_%5C-%5C.%5D)%2B%5C.(%5BA-Za-z%5D%7B2%2C%7D)%24