Github user cbiow commented on the pull request:

    https://github.com/apache/spark/pull/5816#issuecomment-98153450
  
    Didn't seem complex enough to require a JIRA ticket per the guidance in the 
project policy FAQ. This is a simple change greatly improving the regex 
precision, so it will no longer false-alarm on an embedded "-h" anywhere in the 
command line such as in mongodb-hadoop.jar. It could stilll false-alarm if 
someone had an improbable filename with the "-h" occurring at word boundaries, 
like "-h.jar". Fully fixing it would involve using a real command-line options 
parser, which may not be warranted.
    
    There is a much larger issue with the MSWin handling of commified lists 
after the --jar parameter, and I'll file a JIRA ticket on that one, since it 
won't be a one-line change.


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