Adding is.base64 and is.hex

I needed these for a project I'm working on.  Hope you find them useful.
True.  However in Node:

var x = new Buffer('abc', 'hex');

throws

TypeError: Invalid hex string

which is what this test is meant to avoid.

On Mon, Oct 20, 2014 at 11:38 AM, Jordan Harband <notifications@github.com>
wrote:

> In index.js:
>
> > @@ -20,6 +20,9 @@ var NON_HOST_TYPES = {
> >    undefined: 1
> >  };
> >
> > +var base64Regex = /^([A-Za-z0-9+/]{4})*([A-Za-z0-9+/]{4}|[A-Za-z0-9+/]{3}=|[A-Za-z0-9+/]{2}==)$/;
> > +var hexRegex = /^([A-Fa-f0-9]{2})+$/;
>
> Since hex strings are most commonly used in JS as CSS color values, and
> values 2, 3, and 6 characters long are common, I'd say we should support
> that.
>
> —
> Reply to this email directly or view it on GitHub
> <https://github.com/enricomarino/is/pull/12/files#r19092516>.
>



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