\c^/[^/\\]*/[^/\\]*/[^/\\]*$c
[testing \[koth\] in links](https://example.com)
<em>Count</em> <em><strong>up</strong></em> <a href="https://example.com" rel="nofollow noreferrer">example</a> <em><strong>to</strong></em> <span class="math-container">\$21\$</span> <a href="https://codegolf.stackexchange.com/questions/tagged/koth" class="post-tag" title="show questions tagged 'koth'" rel="tag">koth</a>