Php preg_replace尝试中出现未知修饰符错误

所以我做了

$subject = 'sakdlfjsalfdjslfad <a href="something/8230">lol is that true?</a> lalalala';

$subject = preg_replace('<a href="something\/([0-9]+)">(.+?)<\/a>', '$1', $subject);

echo $subject;

但后来PHP又回来了

warning: preg_replace(): Unknown modifier '(' 

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我做错了什么？

模式需要分隔符--斜杠，例如

'/<a href="something\/([0-9]+)">(.+?)<\/a>/'

“/（.+？）/”

在模式周围需要分隔符：

$subject = preg_replace('#<a href="something/([0-9]+)">(.+?)</a>#', '$1', $subject);

$subject=preg#u replace（“##，”$1“，$subject）；

PCRE（与Perl兼容的正则表达式）应该由分隔符包围，因此

<a href="something\/([0-9]+)">(.+?)<\/a>

<a href="something\/([0-9]+)">(.+?)<\/a>

/<a href="something\/([0-9]+)">(.+?)<\/a>/