Support Regex in String.invalid

[WesTyler]

I'm not sure if this is the simplest implementation here, but I took a stab.
Added the antithesis of string.regex as part of the invalid logic to support #1020.

[Marsup]

Oops, bad communication on my part, I should have provided more guidance. I don't want to change the valid/invalid api since it doesn't make sense, just allow for the regex to be inverted. So probably something like regex(pattern, [name | options]) that would still accept the old format but in addition accept an object with { name, reverse/invert/negative/... }. I can't make up my mind about the naming so if you have proposals.

[WesTyler]

Oh, haha, gotcha. That makes more sense. Since it is a completely different direction I'll close this PR for clarity and make a new one later.

[Marsup]

Shall I wait for you for v10 or you don't expect to work on it soon ?

[WesTyler]

I'll have a new PR up later today if you want to wait for v10. :)

[lock]

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