请教该如何用正则替换a标签

Question

请教该如何用正则把a标签的 < " >换成@ # $，而不影响a href的链接和其他标签不允许单独把a标签提取出来替换<div>     <div class="bt">2222</div>     <ul>         <li>1</li>         <li>2</li>     </ul>     <a href="https://segmentfault.com">ok</a></div>结果：    <div>         <div class="bt">2222</div>         <ul>             <li>1</li>             <li>2</li>         </ul>         @a href=# https://segmentfault.com # $ ok @/a$         @a href=# https://segmentfault.com # $ acb @/a$         @a href=# https://segmentfault.com # $ 123 @/a$     </div>