[MERGE] Win32 fixes

[Aaron Bentley]

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John Arbash Meinel wrote:
> Actually, ' is a valid character on a windows path. And I'm sure we want
> to support forward slashes instead of requiring back slashes. I thought
> internally all paths were forward slashed anyway. 

Sure.

> And at the point we
> are at, the path is an absolute path, so I would change it to:

I want to move it into osutils, and have a single 'is this path going to
give Windows a fit?' check, so I'd rather make the leading drive optional.

> _validWin32PathRE = re.compile(r'^[A-Z]:/[^:<>*"?\|\\]*$')
> If we want to support either slash form, then it would be
> _validWin32PathRE = re.compile(r'^[A-Z]:[/\\][^:<>*"?\|]*$')

Yes, we should support either kind of slash.

Aaron
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