fix matching html content as obsidian tags

[kai-kea]

addresses #536

This regex matches obsidian tag style #my-tag only if it's not part of an HTML expression, e.g. from #536, ' will be matched and skipped over.

[nicoberling]

The RegExp you wrote adds an exceptions specifically for HTML special chars, instead it should simply match Obsidian tags, as described in the documentation:
/(?:^|[\t ])(#[a-zA-Z0-9\/_-]*[a-zA-Z\/_-][a-zA-Z0-9\/_-]*)+/g
This matches a tag preceded by the start of the line or whitespace, including at least one alphabetic letter, numbers, the hyphen, slash or underscore. Adapted slightly from here.

[kai-kea]

The RegExp you wrote adds an exceptions specifically for HTML special chars, instead it should simply match Obsidian tags, as described in the documentation:

/(?:^|[\t ])(#[a-zA-Z0-9\/_-]*[a-zA-Z\/_-][a-zA-Z0-9\/_-]*)+/g

This matches a tag preceded by the start of the line or whitespace, including at least one alphabetic letter, numbers, the hyphen, slash or underscore. Adapted slightly from here.

I agree, this solution is much cleaner.