RE_NO_BK_BRACES   144 lib/regex.h    # define RE_NO_BK_BRACES (RE_NEWLINE_ALT << 1)
RE_NO_BK_BRACES   114 test/manual/etags/c-src/emacs/src/regex.h #define RE_NO_BK_BRACES (RE_NEWLINE_ALT << 1)