https://regexper.com/#%2F%5B0-9%5D%5Cs%5B0-9%5D%2F
http://regexone.com/lesson/more_groups
1280x720 提取出1280 720
((\d+)\D(\d+))
实例
/^\w[-\w.+]*@([A-Za-z0-9][-A-Za-z0-9]+\.)+[A-Za-z]{2,14}$/
https://regexper.com/#%2F%5B0-9%5D%5Cs%5B0-9%5D%2F
http://regexone.com/lesson/more_groups
1280x720 提取出1280 720
((\d+)\D(\d+))
实例
/^\w[-\w.+]*@([A-Za-z0-9][-A-Za-z0-9]+\.)+[A-Za-z]{2,14}$/
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