使用正则表达式提取字符串？

Question

Sample Data:

+---------------------------------------------------------------------------------+
|refererurl                                                                       |
+---------------------------------------------------------------------------------+
|https://www.tesco.com/groceries/dfp/dfp-beaa1a3b14.html                          |
|https://www.tesco.com/groceries/dfp/dfp-beaa1a3b14.html                          |
|https://www.tesco.com/groceries/dfp/dfp-beaa1a3b14.html                          |
|https://www.tesco.com/groceries/dfp/dfp-beaa1a3b14.html                          |
|http://mbappgiwwg33nfz2gk43dn4xgo4tpmnsxe6joozuwk5y8.com/                        |
|http://mbappgewtgobzgu4dcmrtgy888888.com/                                        |
|https://www.tesco.com/groceries/dfp/dfp-beaa1a3b14.html                          |
|http://mbappgiwwg33nfz2gk43dn4xgo4tpmnsxe6joozuwk5y8.com/                        |
|https://www.tesco.com/groceries/dfp/dfp-beaa1a3b14.html                          |
|https://www.tesco.com/groceries/dfp/dfp-beaa1a3b14.html                          |
|null                        |
|https://www.tesco.com/groceries/dfp/dfp-beaa1a3b14.html                          |
|http://mbappgiwwg33nfz2gk43dn4xgo4tpmnsxe6joozuwk5y8.com/                        |
|https://www.tesco.com/groceries/dfp/dfp-beaa1a3b14.html                          |
|http://mbappgiwwg33nfz2gk43dn4xgo4tpmnsxe6joozuwk5y8.com/                        |
|https://www.tesco.com/direct/party-gifts-flowers/helium-canisters/cat31450037.cat|
|https://www.tesco.com/groceries/dfp/dfp-beaa1a3b14.html                          |
|https://www.tesco.com/groceries/dfp/dfp-beaa1a3b14.html                          |
|https://www.tesco.com/groceries/dfp/dfp-beaa1a3b14.html                          |
|https://www.tesco.com/groceries/dfp/dfp-beaa1a3b14.html                          |
+---------------------------------------------------------------------------------+

我想要正则表达式如下：

a。我想要一个正则表达式表达式，它可以开始在“ .com”之前向后提取，直到包含.com的网站名称
例如
https://www.tesco.com/groceries/dfp/dfp-beaa1a3b14.html-> tesco.com http://mbappgiwwg33nfz2gk43dn4xgo4tpmnsxe6joozuwk5y8.com-> mbappgiwwg33nfz2gk43dn4xgo4tpmnsxe6joozuwk5y8.com

Answer 1

以下正则表达式似乎可以在这里工作：

[^.\/]+.com

Demo

请注意，这不会考虑诸如tesco.co.uk.com之类的网址，在这种情况下，我们需要做更多的工作。

Answer 2

尝试这个：

(?:http(?:s)?:\/\/(?:www.)?)(.*?)\/

它甚至可以与url一起使用： www.example.co.uk/qsdqsd.html

DEMO