需要一个正则表达式来查找网站url并将其附加到img src - need a regular expression to find and append website url to img src

need a regular expression to find and append website url to img src

我必须在html消息中搜索图像标签，然后将网站url附加到使用正则表达式找到的任何图像url标签上

例如，如果html消息中的图像src是

/images/my_image.jpg

我需要附加url并使其看起来像这样：

http://mywebsite.com/page/images/my_image.jpg

您可能应该使用HTML解析解决方案而不是regex，以避免出现格式错误的代码。类似这样的东西：

// Some example source
$source = <<<EOS
<html><body>
    Images that will have host appended:
    <img src="foo.png" />
    and
    <img src="images/en/87a%20-zzQ.png" />
    Image that will be left as is:
    <img src="https://www.gravatar.com/avatar/1b1f8ad9a64564a9096056e33a4805bf?s=32&amp;d=identicon&amp;r=PG" />
</body></html>
EOS;
// Create a DOM document and read the HTML into it
$dom = new DOMDocument();
$dom->loadHTML($source);
// Use an XPath query to find all 'img' tags 
$xPath = new DOMXPath($dom);
$images = $xPath->query('//img');
// Loop through the tags
foreach ($images as $image) {
    // Grab the 'src' attribute
    $src = $image->getAttribute('src');
    // If the attribute does not already contain a scheme (e.g. http(s)),
    // append the URL with scheme and host
    if ($src && (!parse_url($src, PHP_URL_SCHEME))) {
        $image->setAttribute('src', "http://mywebsite.com/page/" . $src);
    }
}
// Write output
$dom->formatOutput = true;
echo $dom->saveHTML();

输出：

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" "http://www.w3.org/TR/REC-html40/loose.dtd">
<html><body>
        Images that will have host appended:
        <img src="http://mywebsite.com/page/foo.png">
        and
        <img src="http://mywebsite.com/page/images/en/87a%20-zzQ.png">
        Image that will be left as is:
        <img src="https://www.gravatar.com/avatar/1b1f8ad9a64564a9096056e33a4805bf?s=32&amp;d=identicon&amp;r=PG">
</body></html>

您可以使用以下模式：

<?php
    $pattern = "/('/images'/['w'd_]+'.jpg)'1*/ims";
    $string = "bla bla bla /images/my_image.jpg," . 
       "bla bla lba /images/mfsafas.jpg bla bla bla /images/my_fsa.jpg";
    preg_match_all($pattern, $string, $matches);
    foreach($matches[0] as $match) {
       $urls[] = "http://mywebsite.com/page" . $match;
    }