NSTR_AMBIG        110 regparse.h     #define NSTRING_SET_AMBIG(node)        (node)->u.str.flag |= NSTR_AMBIG
NSTR_AMBIG        114 regparse.h     #define NSTRING_IS_AMBIG(node)        (((node)->u.str.flag & NSTR_AMBIG) != 0)