Several unicode whitespace characters are not supported

[Henry-Sarabia]

After some research, it seems the regexp package might not be the best fit for identifying whitespace. Although it does catch some control characters, there are others that are not caught by the regular expression.

The escaped vertical tab character '\v' is whitespace but is not currently identified as such.
The unicode non-breaking space character U+00A0 is also not identified as whitespace.

There are definitely other similar cases. To solve this issue, it may be prudent to replace the regular expression with a more naive but thorough individual rune iteration and inspection.