Add options for MAC address validation without colons, and Numeric validation without symbols

[Maxattax97]

Includes tests and updated README.md.

[profnandaa]

Max, thanks for your contribution!
(1) I would like to understand the essence of checking MAC addresses without the colons? Are there cases where MAC addresses don't have colons?
(2) Would be nice to split this PR into two, one for the MAC address issue, and other for the isNumeric

-na

[Maxattax97]

In the real world, no, MAC addresses should be in a format with colons. However, there are many cases when you are dealing with MAC addresses frequently on forms and such where it's much more portable, easier to type, and (arguably) more human-readable to work without colons.

In my use case, I have a database full of MAC addresses without colons as well as many internal services that I call into which also use this format. I thought other people may have a similar situation, so I accordingly made an option but kept the default functionality.

Splitting makes since, I will take care of that. I apologize, I'm a bit new to submitting PR's, so I wasn't aware that it would take all commits from my forked repo up until the PR was accepted.

[profnandaa]

Splitting makes since, I will take care of that. I apologize, I'm a bit new to submitting PR's, so I wasn't aware that it would take all commits from my forked repo up until the PR was accepted.

The best way is to create a branch for each feature, and not committing from your fork's master.

The rest makes sense to me, thanks for explaining 👍

[Maxattax97]

That was messy, but it was small and simple enough to learn a couple new git commands.

I'll close this so that the new PR's may address the features individually.