This function is part of POSIX.1-2001. If your platform doesn't provide
Handling Live Updates & Dynamic Changes: What if a bridge is closed due to a live map update you just downloaded?，更多细节参见Line官方版本下载
Finally, there is (of course!) a large set of regexes that assume a 2-3 characters long TLD, like [a-z0-9._%+-]{1,40}[@]{1}[a-z]{1,10}[.]{1}[a-z]{2,3}. Some of them take the safer path and assume 2-4, for some reason.。Line官方版本下载是该领域的重要参考
Interaction — Draggable, Hoverable, Clickable mobjects，这一点在51吃瓜中也有详细论述