Github user steveloughran commented on the issue:
https://github.com/apache/spark/pull/14731
Having looked at the source code, `FileSystem.globStatus()` uses the glob
patterns, which are not the same as the posix regexp ones.
[org.apache.hadoop.fs.GlobPattern](http://grepcode.com/file/repo1.maven.org/maven2/org.apache.hadoop/hadoop-common/2.7.1/org/apache/hadoop/fs/GlobPattern.java#81)
does the conversion.
For the docs, I'll just use a wildcard * in the example, rather than try
anything more sophisticated.
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