在 PHP中使用正则表达式查找 <head> 内的所有 <style> 标签
我正在尝试使用 Regex 查找<style内部的所有标签<head>。
我已经编写了在整个 HTML 中找到它的代码：
$regex = '/(<style.*>(.*)<\/style>)/Usmi';
preg_match_all($regex, $content, $matches);
foreach ($matches[1] as $key => $style_tag) {
$css = $matches[2][$key];
// $style_tag will contain full tag and $css will contain its content
}
但我只想<style>在里面找到标签<head>。
我尝试了以下方法，但它只捕获了第一个<style>标签：
$regex = '/(<style.*>(.*)<\/style>).*<\/head>/Usmi';
preg_match_all($regex, $content, $matches);
foreach ($matches[1] as $key => $style_tag) {
}
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1回答
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繁花不似锦
使用 positive look ahead 检查是否有结束head标签$content = "<html><head> <style>something</style> <style class='my-class'>other</style></head><body> <style>content</style></body></html>";preg_match_all('#(<style.*>(.*)</style>)(?=.*</head>)#Usmi', $content, $matches);print_r($matches);给我Array( [0] => Array ( [0] => <style>something</style> [1] => <style class='my-class'>other</style> ) [1] => Array ( [0] => <style>something</style> [1] => <style class='my-class'>other</style> ) [2] => Array ( [0] => something [1] => other ))
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