https://regexr.com/
(?<name>.*).\d{1,4}.\d{1,4}.\d{1,4}.?\d{0,4}?
list查看筛选结果
detail里面可以看到当前行,匹配的结果,以及group的匹配结果
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}$/