Github user taoli91 commented on the pull request:
https://github.com/apache/spark/pull/12695#issuecomment-215283532
> Where you're manually handling paths with regexes seems suboptimal.
@srowen The regex parts are actually dealing with the URI. The default URI
can't correctly handle the absolute Windows local path. It will recognize the
drive label to be scheme. For example `new URI("D:\test")` will return a scheme
of D. I can't find a JDK method to handle this problem, thus I have to use
regex to find out the label and manually append a `/` in front of the path.
E.g., convert `D:\test` to `/D:/test` before passing to the constructor of URI
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