RE_BK_PLUS_QM      82 lib/regex.h    # define RE_BK_PLUS_QM (RE_BACKSLASH_ESCAPE_IN_LISTS << 1)
RE_BK_PLUS_QM      52 test/manual/etags/c-src/emacs/src/regex.h #define RE_BK_PLUS_QM (RE_BACKSLASH_ESCAPE_IN_LISTS << 1)