Re: Adding new escapes to regex module

> On 16 Aug 2022, at 21:24, MRAB <[email protected]> wrote:
> 
> 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.

You seem to be mixing the use \ as the escape for strings and the \ that re uses.
Is it the behaviour that '\<unknown>' becomes '\\<unknown>' that means this is a breaking change?

Won't this work?
```
re.compile('\v:\\v')
# which is the same as
re.compile(r'\x0b:\v')
```

Barry

> 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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