HTML not encoded in the listing of replacements

[Salubritas]

Thank you for the great extension!

HTML is not encoded in the list of replacements that have been set up, making it difficult to see them properly.
e.g. replacing
<h2 class="bigquote">([^&lt;]+)</h2>
with
<aside class="pullquote">$1</aside>
only shows
([^<]+) --> $1

[jkingsman]

I think that this is likely to be destructive to people who want to replace strings that show up in tags -- the page can get mangled pretty quickly. I'd be totally open to a PR to enable HTML replacement for certain rules if you feel so moved!