PHP 正则表达式匹配字符串 - 如何提取 "url" 后的值 - 常规

在PHP中可以使用正则表达式来匹配字符串中的内容。可以使用preg_match函数来实现匹配。
以下是一个例子，演示如何使用preg_match匹配'url'后面的字符串：
<?php
$str = '    var config = {
        'api': '/dmku/',
        'av': '',
        'url': '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',
    	'id':'9d7b513fa2bc4538b145',
    	'sid':'',
    	'pic':'',
    	'title':'',
    	'next':'',
    	'user': '',
    	'group': '',
    }';

$pattern = '/'url': '(.*?)'/';
preg_match($pattern, $str, $matches);
$url = $matches[1];

echo $url; // 输出：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