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javascript-php 正则获取二级域名。

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Release： 2016-06-02 11:28:27
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正则javascriptphp

《a href="xxx.xxx.com"》测试《/a》
《a href="xxx.xxx.com/xxx/"》测试2《/a》
《a href="xxx.xxx.com/aaa/bbb.js?ss=aa"》测试3《/a》
《a href="xxx.xxx.com/xxx/sdadsde.html"》测试4《/a》

怎么用正则取出“ xxx.xxx.com”和“测试“，“xxx.xxx.com/xxx/”和“测试2”。
谢谢了！！！！（怕写被吞，就换成大写了，大神将就下...）

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