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php 正则如何匹配2级域名

WBOY
Release： 2016-06-23 13:59:20
Original
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域名状态可能是：
xinwen.xxx.com
xinwen.xxx.cn
xinwen.xxx.net
http://xinwen.xxx.com/

php 如何用正则表达式 preg_replace 得到， xinwen 


回复讨论(解决方案)

(?:http\:\/\/)?([^.]+)\.xxx\.(?:(com|cn|net)) 

$s=<<<TXTxinwen.xxx.comxinwen.xxx.cnxinwen.xxx.nethttp://xinwen.xxx.com/TXT;preg_match_all('#(^|/)([^/\.]+)\.#m',$s,$ar);print_r($ar[2]);
Copy after login

Array
(
    [0] => xinwen
    [1] => xinwen
    [2] => xinwen
    [3] => xinwen
)

正则都要mark学习  弱项

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php 正则如何匹配2级域名
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