PHP用正则匹配获取URL中的域名
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
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
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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