Other regex implementations have escape sequences for horizontal
whitespace (`\h` and `\H`) and vertical whitespace (`\v` and `\V`).
The regex module already supports `\h`, but I can't use `\v` because it
represents `\0x0b', as it does in the re module.
Now that someone has asked for it, I'm trying to find a nice way of
adding it, and I'm currently thinking that maybe I could use `\y` and
`\Y` instead as they look a little like `\v` and `\V`, and, also,
vertical whitespace is sort-of in the y-direction.
As far as I can tell, only ProgressSQL uses them, and, even then, it's
for what everyone else writes as `\b` and `\B`.
I want the regex module to remain compatible with the re module, in case
they get added there sometime in the future.
Opinions?
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