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* doc: spell "back-reference" more consistentlyPaul Eggert2019-12-301-1/+1
* maint: update all copyright dates via "make update-copyright"Jim Meyering2019-01-011-1/+1
* maint: update gnulib and copyright dates for 2018Jim Meyering2018-01-061-1/+1
* maint: update gnulib and copyright dates for 2017Jim Meyering2017-01-011-1/+1
* maint: update copyright year, bootstrap, init.shJim Meyering2016-01-011-1/+1
* maint: update copyright year ranges to include 2015Jim Meyering2015-01-011-1/+1
* grep -P: fix it so backreferences now work with -w and -xStephane Chazelas2014-02-241-0/+28