test_str = (
    '-rw-r--r--   1 owner    group        75148624 Jan  6  2015 somename.csv-rw-r--r--   1 owner    group       223259072 Feb 26  2015 somename.csv-rw-r--r--   1 owner    group         4041411 Jun  5  2015 somename-adjusted.csv-rw-r--r--   1 owner    group         2879228 May 13  2015 somename.csv-rw-r--r--   1 owner    group        11832668 Feb 13  2015 somename.csv-rw-r--r--   1 owner    group         1510522 Feb 19  2015 somename.csv-rw-r--r--   1 owner    group         2826664 Feb 25  2015 somename.csv-rw-r--r--   1 owner    group          582985 Feb 26  2015 somename.csv-rw-r--r--   1 owner    group          212427 Feb 26  2015 somename.csv-rw-r--r--   1 owner    group         3015592 Feb 27  2015 somename.csv-rw-r--r--   1 owner    group          103576 Feb 27  2015 somename-corrected.csv'
    )
Python Regular expression Lookahead overshooting pattern