php preg_replace求解
如题，有一段文本
123456abcdefgsdfsdafdfabcdffsafd
目标:将第二次出现的abc进行替换,第一次不做操作
菜鸟求解
------解决方案--------------------
$str = '123456abcdefgabceeesdfsdafdfabcdffsafdabcdefg';
$str = preg_replace('/(?))abc/iU', '---', $str);
echo $str,'
';
只适用于有且仅有标签
------解决方案--------------------
<br />
<br />
<?php <br />
<br />
$str = '<p>元<a target="_blank" href="http://www.trjcn.com/news/news--type-list/cid-21/industry_id-14.html">半导体材料</a><a target="_blank" href="http://www.trjcn.com/news/news--type-list/cid-21/industry_id-14.html">半导体</a>制造厂，导体导体导体导体导体<a target="_blank" href="http://www.trjcn.com/news/news--type-list/cid-21/industry_id-14.html">半导体</a></p><div class="aritcle_card flexRow">
<div class="artcardd flexRow">
<a class="aritcle_card_img" href="/ai/2127" title="Amazon Nova"><img
src="https://img.php.cn/upload/ai_manual/000/000/000/175679969158525.png" alt="Amazon Nova" onerror="this.onerror='';this.src='/static/lhimages/moren/morentu.png'" ></a>
<div class="aritcle_card_info flexColumn">
<a href="/ai/2127" title="Amazon Nova">Amazon Nova</a>
<p>亚马逊云科技（AWS）推出的一系列生成式AI基础模型</p>
</div>
<a href="/ai/2127" title="Amazon Nova" class="aritcle_card_btn flexRow flexcenter"><b></b><span>下载</span> </a>
</div>
</div>';<br />
<br />
<br />
$str = preg_replace('/(导体)(?!(:?[^<]<br><font color='#FF8000'>------解决方案--------------------</font><br><(?!a)[^>]*>)*<\/a>)/imu', '<a>$1</a>', $str);<br />
<br />
echo $str;<br />
<br />
<br />
。。。。。。这个才是
