New Feature - Negative Regex

Hi, first of all, really appreciate all the effort on this fantastic library.

I’d like to suggest what I think is a minor improvement…a negative regex test.

Rationale: It can be quite complex to write the inverse of a regex (negative look ahead etc) and would be much simpler to have the ability to negate the result of the match.

Suggestion: Rather than change the current API, I would suggest negex( regex, message) but entirely up to you.

Apologies if there is another idomatic way of achieving the same outcome.

Background: I’m using tiptap as a Wysiwyg editor. When it’s input is empty, rather than "", it returns "<p></>". I want to error if the regex does not match /^<p><\/>$/, rather than if it does. Currently I preprocess the input to coerce "<p></>" to "".

[colinhacks]

I’d suggest calling this method .not to be in closer agreement with .and and .or.

Though I’m down to include .negex as well - cool name 😃

[stale[bot]]

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