see a url regular expression on the Internet:
(https?|ftp|file)://[-A-Za-z0-9+&@-sharp/%?=~_|!:,.;]+[-A-Za-z0-9+&@-sharp/%=~_|]
must start with http: , and
if you don"t need http:, you can also . How can I modify it? The following
/ / www.baidu.com
? means that the previous content matches 0 or 1 times. Add ? after (https? | ftp | file): ) to indicate that the previous content can appear 0 times or 1 times, that is to say, there can be protocols or no protocols in url .
(?:(https?|ftp|file):)?//[-A-Za-z0-9+&@-sharp/%?=~_|!:,.;]+[-A-Za-z0-9+&@-sharp/%=~_|] I don't know if you use it in js. If you use it in js, these two / / need to be escaped:
let reg = /(?:(https?|ftp|file):)?\/\/[-A-Za-z0-9+&@-sharp/%?=~_|!:,.;]+[-A-Za-z0-9+&@-sharp/%=~_|]/-sharp | http
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