匹配所有 HTML 标签，除了<li>用正则表达式</li>

Question

I want to check some string containing HTML to see if it will contain any <li> elements, and filter out every element except for the <li> elements.

For example,

<li>foo</li><p><em>bar</em><em style="color: rgb(161, 0, 0);">fiddle</em></p><p><em class="ql-font-couriernew" style="color: rgb(61, 20, 102);">dog</em></p>

Would become

<li>foo</li>barfiddledog

I can figure out how to capture just <li> elements, or all HTML elements, but I can't figure out how to capture only elements that are not <li> .

I am using (<\/?[^(li)]>)+ , but this seems to only filter out the <p> and </p> tags.

Answer 1

Something like <\/?(?:(?.li).)+> should do the trick. I've taken notes from https://stackoverflow.com/a/977294/9484862 to edit your existing regex code, which was already nearly working.