Regex for selecting files in 6 hour intervals -


i have list of files timestamp in file name, named in form: 

file_year-month-date-hour-minute.something.gz.

for instance there files named 

file_2013-06-17-00-05.something.gz  file_2013-06-17-00-10.something.gz

i need select files in 6 hour intervals regex. selecting "file_year-month-date*" gives me daily files, not sure how filter down 6 hour chunks.

you can regex if must:

file_\d{4}-\d{2}-\d{2}-(?:00|06|12|18|24)-(?:[0-5][0-9])\..+?\.gz

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