Gutenberg Compatibility

[trepmal]

Not strictly a Gutenberg/Block Editor problem, but that does make it vastly easier to create incompatible headings.

The regex only matches plain tags:

table-of-contents/table-of-contents.php

Line 129 in 5b3da29

preg_match_all( "/(<{$tag}>)(.*)(<\/{$tag}>)/", $content, $matches, PREG_SET_ORDER );

Any attributes added such as alignment mean the regex won't "find" the heading tag to add to the TOC.