RE_BK_PLUS_QM      48 maint/gnulib/lib/regex-quote.c #define RE_BK_PLUS_QM    0x00000002
RE_BK_PLUS_QM      82 maint/gnulib/lib/regex.h # define RE_BK_PLUS_QM (RE_BACKSLASH_ESCAPE_IN_LISTS << 1)