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grep -P doesn't work, pcregrep does #906
Big admirer of perl regular expressions. Enjoy them most with grep. Couldn't help to notice, that
it looks like pcre USE flag is turned off in https://github.com/coreos/coreos-overlay/blob/master/profiles/coreos/base/make.defaults#L19, but it's not clear why that is the case. perhaps @marineam knows?