php preg_match 找不到文本答案

【问题标题】：php preg_match not finding textphp preg_match 找不到文本
【发布时间】：2016-01-10 11:55:27
【问题描述】：

字符串是：

<div class="item-inner clearfix"> <div class="item-img have-additional clearfix"> <div class="cart-wrap"> <button title="Sәbәtә әlavә et" class="btn-cart" onclick="setLocation('https://az.from.ae/az/checkout/cart/add/uenc/aHR0cHM6Ly9hei5mcm9tLmFlL2F6L2NhdGFsb2dzZWFyY2gvcmVzdWx0L2luZGV4Lz9xPWlwaG9uZSs1cysxNitnYiZjYXQ9MzkmZGlyPWFzYyZvcmRlcj1wcmljZSZsaW1pdD0yNA,,/product/412/form_key/XUXNITbPm6bBkzTQ/')" data-toggle="tooltip" data-original-title="Sәbәtә әlavә et">Sәbәtә әlavә et</button> </div> <div class="item-img-info"> <a href="https://az.from.ae/az/apple-iphone-5s-16-gb-4g-lte-wi-fi-space-gray" title="Apple iPhone 5S (16 GB, 4G LTE + Wi-Fi, Space Gray) Apple iPhone 5S (16 GB, 4G LTE + Wi-Fi, Space Gray)" class="product-image"> <span class="img-main"> <img width="270" height="270" src="https://az.from.ae/media/product/78d/apple-iphone-5s-16-gb-4g-lte-wi-fi-space-gray-buy-apple-iphone-5s-cbf.jpg" alt="Apple iPhone 5S (16 GB, 4G LTE + Wi-Fi, Space Gray) Apple iPhone 5S (16 GB, 4G LTE + Wi-Fi, Space Gray)"/> </span> </a> </div> </div> <div class="item-info"> <div class="info-inner"> <div class="item-title"> <a href="https://az.from.ae/az/apple-iphone-5s-16-gb-4g-lte-wi-fi-space-gray" title="Apple iPhone 5S (16 GB, 4G LTE + Wi-Fi, Space Gray)"> Apple iPhone 5S (16 GB, 4G LTE + Wi-Fi, Space Gray) </a> </div> <div class="item-content"> <div class="item-price"> <div class="price-box"> <span class="regular-price" id="product-price-4128672363671444684686"> <span class="price">AZN  522</span> </span> </div> </div> <p class="no-rating"><a href="https://az.from.ae/az/apple-iphone-5s-16-gb-4g-lte-wi-fi-space-gray/reviews/#review-form">Rəyinizi bildirin</a></p> </div> </div> </div></div>

我的字符串也是这样的：

<div class="item-inner clearfix"> <div class="item-img have-additional clearfix"> <div class="cart-wrap"> <span class="btn-cart availability out-of-stock"><span>Out of stock</span></span> </div> <div class="item-img-info"> <a href="https://az.from.ae/az/apple-iphone-5s-64-gb-4g-lte-wi-fi-gold" title="Apple iPhone 5S (64 GB, 4G LTE + Wi-Fi, Gold) Apple iPhone 5S (64 GB, 4G LTE + Wi-Fi, Gold)" class="product-image"> <span class="img-main"> <img width="270" height="270" src="https://az.from.ae/media/product/d3e/apple-iphone-5s-64-gb-4g-lte-wi-fi-gold-buy-apple-iphone-5s-2dd.jpg" alt="Apple iPhone 5S (64 GB, 4G LTE + Wi-Fi, Gold) Apple iPhone 5S (64 GB, 4G LTE + Wi-Fi, Gold)"/> </span> </a> </div> </div> <div class="item-info"> <div class="info-inner"> <div class="item-title"> <a href="https://az.from.ae/az/apple-iphone-5s-64-gb-4g-lte-wi-fi-gold" title="Apple iPhone 5S (64 GB, 4G LTE + Wi-Fi, Gold)"> Apple iPhone 5S (64 GB, 4G LTE + Wi-Fi, Gold) </a> </div> <div class="item-content"> <div class="item-price"> <div class="price-box"> <span class="regular-price" id="product-price-4166746673391444684602"> <span class="price">AZN  633</span> </span> </div> </div> <p class="no-rating"><a href="https://az.from.ae/az/apple-iphone-5s-64-gb-4g-lte-wi-fi-gold/reviews/#review-form">Rəyinizi bildirin</a></p> </div> </div> </div></div>

我的代码是：

preg_match('/" title="(.*?)">/mis', $product, $names);

为什么不返回Apple iPhone 5S（16 GB，4G LTE + Wi-Fi，深空灰）？

【问题讨论】：

它是not a good idea to parse HTML with regex。改为考虑DOMDocument
我相信，要从 HTML 中提取信息，正则表达式比处理整个文档以找到 1~5 行更有用。 HTML 解析器应该用于更复杂的操作，而不是像这样的简单搜索。

标签： php preg-match

【解决方案1】：

只需使用preg_match_all("/\" title=\"(.*?)\"/im", $html, $res)，$res[1] 将包含您要查找的内容。
Result:

Array
(
    [0] => Array
        (
            [0] => " title="Apple iPhone 5S (16 GB, 4G LTE + Wi-Fi, Space Gray) Apple iPhone 5S (16 GB, 4G LTE + Wi-Fi, Space Gray)"
            [1] => " title="Apple iPhone 5S (16 GB, 4G LTE + Wi-Fi, Space Gray)"
            [2] => " title="Apple iPhone 5S (64 GB, 4G LTE + Wi-Fi, Gold) Apple iPhone 5S (64 GB, 4G LTE + Wi-Fi, Gold)"
            [3] => " title="Apple iPhone 5S (64 GB, 4G LTE + Wi-Fi, Gold)"
        )

    [1] => Array
        (
            [0] => Apple iPhone 5S (16 GB, 4G LTE + Wi-Fi, Space Gray) Apple iPhone 5S (16 GB, 4G LTE + Wi-Fi, Space Gray)
            [1] => Apple iPhone 5S (16 GB, 4G LTE + Wi-Fi, Space Gray)
            [2] => Apple iPhone 5S (64 GB, 4G LTE + Wi-Fi, Gold) Apple iPhone 5S (64 GB, 4G LTE + Wi-Fi, Gold)
            [3] => Apple iPhone 5S (64 GB, 4G LTE + Wi-Fi, Gold)
        )

)

我建议你使用http://regexr.com/ 来测试你的正则表达式。

【讨论】：

【解决方案2】：

试试这个模式preg_match('#title="([^"]*)"#', $product, $names);

$names[1] 将包含您需要的内容

另外 - 这应该可以帮助您调试这类事情

https://regex101.com/

【讨论】：

我编辑了我的问题，请再次检查。 $product 字符串可以是第一个或第二个。我需要获取产品名称
preg_match('#title="([^"]*)"#', $product, $names); - 试试这个
用 preg_match_all() 尝试相同的模式 - 但是如果你试图解析一些站点，你必须以某种方式选择正确的匹配 - 也许你应该使用 simplehtmldom 之类的东西而不是 preg 跨度>