Question

使用正则表达式来捕获某个范围内包含的HTML时出现问题。尝试让它在NameMC.com上获得safeytrfyh is available!以制作快速检查程序，如果用户名可用，则会检查预先指定的列表，而不是经常输入用户名并单击检查。

你们可以使用的示例页面是https://namemc.com/u/safeytrfyh 我正在使用cURL：

<?php
//Urls to scrape from.
$URLs = array();
$URLs[] = 'https://namemc.com/u/safeytrfyh';
$working = '';

//Curl scraper.
foreach($URLs as $URL){
$ch     = curl_init();
curl_setopt($ch, CURLOPT_URL, $URL);
curl_setopt($ch, CURLOPT_USERAGENT, 'Mozilla/5.0 (Windows NT 6.3; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/39.0.2171.95 Safari/537.36');
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_HEADER, 1);        
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1);
$page = curl_exec($ch);
$accounts = array();
preg_match_all('#<div><span[^>]*>(.*?)</span></div>#',$page,$accounts);
foreach($accounts[0] as $account){
    $working .= ''.$account.''. PHP_EOL . '';
}
}

//Put the scraped check into the new .txt file.
file_put_contents('accounts.txt', $working, FILE_APPEND);
?>

Answer 1

通常更简单/效率更低的方法通常是使用整齐的前端遍历HTML结构，例如QueryPath等qp($html)->find(".alert-danger .alert-link")->text()。虽然实际上对于具体任务看起来不太可靠。

现在，如果出于某种原因，您不想查看HTML源代码，调整正则表达式，或者不知道占位符如何工作;那么一个更简单的选择就是匹配原始文本：

$text = strip_tags($html);
preg_match_all("/(\w+) \s+ is \s+ available/x", $text, $matches);

其中\w+代表单词字符，\s+代表空格，/x代表可读性。

Answer 2

You can convert page in to DOM object can get what ever you want as: 

    <?php
            $url = "http://stackoverflow.com/";
            $ch     = curl_init();
            curl_setopt($ch, CURLOPT_URL, $url);
            curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 0); //  if page is https (use if you are using local host)
            curl_setopt($ch, CURLOPT_USERAGENT, 'Mozilla/5.0 (Windows NT 6.3; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/39.0.2171.95 Safari/537.36');
            curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
            curl_setopt($ch, CURLOPT_HEADER, 1);        
            curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1);

             $page = curl_exec($ch);  //  Can echo to check page 

                $dom = new DOMDocument();
                @$dom->loadHTML($page);
                $xpath = new DOMXPath( $dom );
                $query21 = '//div[@id="question-mini-list"]//h3//a[@class="question-hyperlink"]' ; 
                $nodes21 = $xpath->query( $query21 );  

                $title = "questions.txt";
                $file_title = fopen($title, 'w');

                foreach( $nodes21 as $node21 )
                  {
                    $tit = trim($node21->nodeValue);  // HEADING 
                    fwrite($file_title, $tit . "\r\n");
                   }        

    ?>

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preg_match_all正则表达式

2 个答案: