Clarify definition of whitespace (blank characters)

[jotaen]

@vladdeSV next try to fix #90.

See here for Unicode space separator category.

[vladdeSV]

I think this looks much better, and more understandable.

Sidenote, and I do not think this is a big issue, but different RegEx parsers interpret the RegEx provided differently. JavaScript's built-in RegEx parser does not handle \p{L}. I am not entirely sure what the de-facto RegEx spec is, just that it could (maybe) be interpreted differently.

[jotaen]

Cool, thanks for your feedback!

I’m not sure anymore why I included the regex originally, since it actually doesn’t add anything to the Unicode category, which is well-defined and unanimous already.