For the record, the doc/test confusion was fixed by commit b73296ace186451b096b075461634c153d1fa525 http://git.savannah.gnu.org/cgit/grep.git/commit/?id=b73296ace186451b096b075461634c153d1fa525
See also https://debbugs.gnu.org/cgi/bugreport.cgi?bug=22655#47 and below about PCRE_MULTILINE.
