这应该工作.它可能有一些缺点,但我现在无法想到.如果有人想改进它,请随意这样做.
原文链接：https://www.f2er.com/regex/357233.html/http:\/\/(?:www\.)?([a-z0-9\-]+)(?:\.[a-z\.]+[\/]?).*/i
http:\/\/ matches the "http://" part
(?:www\.)? is a non-capturing group that matches zero or one "www."
([a-z0-9\-]+) is a capturing group that matches character ranges a-z,0-9
in addition to the hyphen. This is what you wanted to extract.
(?:\.[a-z\.]+[\/]?) is a non-capturing group that matches the TLD part (i.e. ".com",".co.uk",etc) in addition to zero or one "/"
.* matches the rest of the url
