Home php教程 php手册 PHP用正则匹配获取URL中的域名

PHP用正则匹配获取URL中的域名

Jun 13, 2016 am 09:39 AM
url regular expression

在PHP的官网上看到的parse_url()函数的替代方案。结果和parse_url()函数差不多,是使用正则实现的。

URI 是 Web上可用的每种资源 - HTML文档、图像、视频片段、程序等 - 由一个通用资源标志符(Uniform Resource Identifier, 简称"URI")进行定位。 对象分组:

^(([^:/?#]+):)?(//([^/?#]*))?([^?#]*)(\?([^#]*))?(#(.*))?
12            3  4          5       6  7        8 9
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测试代码如下:

<?php
$search = '~^(([^:/?#]+):)?(//([^/?#]*))?([^?#]*)(\?([^#]*))?(#(.*))?~i';
$url = 'http://www.bkjia.com/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)); /* 各分组如下 $1 = http: $2 = http $3 = //www.bkjia.com $4 = www.bkjia.com $5 = /pub/ietf/uri/ $6 = $7 = $8 = #Gonn $9 = Gonn */ ?>

上面的正则表达式可以获取URL中的任何一部分,下面的代码则简单一些:

<?php 
// 从 URL 中取得主机名 
preg_match("/^(http:\/\/)?([^\/]+)/i", "http://www.bkjia.com/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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