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PHP regular matching code to obtain the domain name in the URL

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Release： 2016-07-25 09:00:29
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Use PHP regular expressions to get the domain name in the URL. Here are two small examples. They are simple and practical. Friends in need, come and take a look.

URL A Universal Resource Identifier (Uniform Resource Identifier, referred to as "URI") for positioning. Object grouping: ^(([^:/?#]+):)?(//([^/?#]*))?([^?#]*)(?([^#]*))?(# (.*))? 12 3 4 5 6 7 8 9

Example 1,

<?php
 $search = '~^(([^:/?#]+):)?(//([^/?#]*))?([^?#]*)(\?([^#]*))?(#(.*))?~i';
 $url = 'http://bbs.it-home.org/pub/ietf/uri/#Gonn';
 $url = trim($url);
 preg_match_all($search, $url ,$rr);
 printf("<p>输出URL数据为：</p><pre class="brush:php;toolbar:false">%s
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n",var_export( $rr ,TRUE)); /* Each group is as follows $1 = http: $2 = http $3 = //bbs.it-home.org $4 = bbs.it-home.org $5 = /pub/ietf/uri/ $6 = $7 = $8 = #Gonn $9 = Gonn */ ?>

The above regular expression can obtain any part of the URL. The code below is more concise and easier to understand. 

<?php 
 // 从 URL 中取得主机名 
 preg_match("/^(http://)?([^/]+)/i", "http://bbs.it-home.org/index.html", $matches); 
 $host = $matches[2]; 
 // 从主机名中取得后面两段 
 preg_match("/[^./]+.[^./]+$/", $host, $matches); 
 echo "domain name is: {$matches[0]}n"; 
?>
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Related labels：
PHP正则匹配获取URL中域名的代码
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