Outputting only the match / capturing group with grep ↗ Reading List
<time datetime="2022-05-26 09:22:12 +0200 +0200">26 May 2022</time><span class="px-2 text-primary-500">·</span><span>26 words</span><span class="px-2 text-primary-500">·</span><span title="Reading time">1 min</span>
Grep doesn’t handle capturing groups, but with lookaround you can match and exclude prefixes. This leaves you with the part of the pattern that you needed.