Proper tagging on upper case vs lower case

Filed an Issue ActivityPub for WordPress. (GitHub)
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Not quite sure what may be causing it, but I’ve noticed on my site that I get a properly tagged but don’t get it properly tagged when I use lower case . Is this to be expected or something in the line of a regex issue?

Examples: [1] [2]

I’m continually astounded by Matthias Pfefferle’s (or I might alternately tag: @pfefferle@notiz.blog) excellent work with the ActivityPub plugin for WordPress! It’s simply brilliant that my IndieWeb powered WordPress website can act much like a standalone version of Mastodon and reasonably federate with other platforms that use the ActivityPub protocol.

You can follow me at @chrisaldrich@boffosocko.com and apparently read my 8,000+ posts via Mastodon and other platforms.

While the plugin doesn’t support everything (yet) and doesn’t compete with Mastodon, Friendi.ca, or GNU.social, it extends WordPress with some reasonably solid fediverse features. I can’t wait to see how it continues to grow and add additional functionality.