How to compose a regular expression to search for nested tags?

Question

Regular Expressions

Hello! Please help me compose a recursive regular expression to search for tags.

I try to do this:
<([^>]+)>((?R)|.+)<\/\1>
I expect that this regular expression will search for paired tags <b></b>, after which the content will be searched again, and if nothing is found, it will place the content in a separate group.
Testing on a line

<ul><li>1<span>qwe</span></li><div>sometext</div></ul><div></div>.

I can't figure out why it doesn't work.

Thank you.

Answer 1

twist greed
and what is it
((?R)|.+)
why not [^<]+