在PHP中使用正则表达式XPath->评估 [英] Using Regex in PHP XPath->evaluate

问题描述

作为一个简单的例子，我试图获取包含电子邮件地址的所有dom对象。

As a simple example I'm trying to get all the dom objects that contain email addresses.

    $doc = new DOMDocument;
    $doc->loadHTML($page);

    $xpath = new DOMXPath($doc);
    $body = $doc->getElementsByTagName('table')->item(0);
    $query = "//text()[fn:matches(., '[\w\d\.-]+@[\w\d\.-]+\.[a-zA-Z]{2,4}')]"; // 
    $entries = $xpath->evaluate($query, $body); // 
    foreach ($entries as $entry) {
        echo "Found {$entry->textContent}<br>\n";
    }

我收到错误：DOMXPath： ：evaluate（）[domxpath.evaluate]：xmlXPathCompOpEval：函数将绑定到未定义的前缀fn ...

我也试过方法

//text()[
    php:function('BooleanPregMatch', '[\w\d\.-]+@[\w\d\.-]+\.[a-zA-Z]{2,4}', .)
]

没有成功。

我还没有找到很多与fn：match或php：function相关的例子。任何帮助将不胜感激。

I haven't been able to find many examples related to fn:match or php:function. Any assistance would be appreciated.

推荐答案

fn：matches 是XPath 2.0，在DOMXPath中，您有XPath 1.0。这就是为什么它不起作用，不支持。

fn:matches is XPath 2.0, in DOMXPath, you have XPath 1.0. That's why it doesn't work, it's not supported.

手册中提供了 php：function 的示例 DOMXPath :: registerPhpFunction 。您需要具有PHP 5.3才能注册功能。

Examples for php:function are available on the manual page for DOMXPath::registerPhpFunctions. You need to have PHP 5.3 to register functions.

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