html解析正则表达式 - HTML-parsing regular expression

HTML-parsing regular expression

本文关键字：正则表达式 html | 更新日期: 2023-09-27

我想解析一个HTML文档并获取所有用户的昵称。

格式如下:

<a href="/nickname_u_2412477356587950963">Nickname</a>

如何在PHP中使用正则表达式?我不能使用DOMElement或简单的HTML解析

下面是不使用正则表达式的工作解决方案:

DomDocument::loadHTML()是忘记足够的工作在畸形的HTML。

<?php
    $doc = new DomDocument;
    $doc->loadHTML('<a href="/nickname_u_2412477356587950963">Nickname</a>');
    $xpath = new DomXPath($doc);
    $nodes = $xpath->query('//a[starts-with(@href, "/nickname")]');
    foreach($nodes as $node) {
        $username = $node->textContent;
        $href = $node->getAttribute('href');
        printf("%s => %s'n", $username, $href);
    }

preg_match_all(
    '{                  # match when
        nickname_u_     # there is nickname_u
        ['d+]*          # followed by any number of digits
        ">              # followed by quote and closing bracket
        (.*)?           # capture anything that follows
        </a>            # until the first </a> sequence
    }xm',
    '<a href="/nickname_u_2412477356587950963">Nickname</a>',
    $matches
);
print_r($matches);

在HTML解析器上使用Regex的免责声明适用。以上可能可以改进为更可靠的匹配。