我正在嘗試使用 Regex 查找<style內(nèi)部的所有標簽<head>。我已經(jīng)編寫了在整個 HTML 中找到它的代碼：$regex = '/(<style.*>(.*)<\/style>)/Usmi';preg_match_all($regex, $content, $matches);foreach ($matches[1] as $key => $style_tag) { $css = $matches[2][$key]; // $style_tag will contain full tag and $css will contain its content}但我只想<style>在里面找到標簽<head>。我嘗試了以下方法，但它只捕獲了第一個<style>標簽：$regex = '/(<style.*>(.*)<\/style>).*<\/head>/Usmi';preg_match_all($regex, $content, $matches);foreach ($matches[1] as $key => $style_tag) {}
1 回答
繁花不似錦
TA貢獻1851條經(jīng)驗 獲得超4個贊
使用 positive look ahead 檢查是否有結(jié)束head標簽
$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);
給我
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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