Add support for regexes to allow property values

[aprendendofelipe]

Initial checklist

• [x] I read the support docs
• [x] I read the contributing guide
• [x] I agree to follow the code of conduct
• [x] I searched issues and couldn’t find anything (or linked relevant results below)
• [x] If applicable, I’ve added docs and tests

Description of changes

Sometimes it can be unsafe to allow any values for a property while there may be so many safe values that you would need to pass a very large list.

I propose to also accept RegEx in the list of allowed property values.

[aprendendofelipe]

Good idea. Some ideas on how to improve it. Also, CI is failing, seems to be due to the changes, or was it already failing locally for you?

It was giving error because of the typing of handleTagName, so I ignored the errors and didn't catch the new errors. Now it's passing.

[github-actions[bot]]

Hi! This was closed. Team: If this was merged, please describe when this is likely to be released. Otherwise, please add one of the no/* labels.

[wooorm]

Thanks, released!