    RE_NO_BK_PARENS  2394 libglibc/regex.c           if (syntax & RE_NO_BK_PARENS)
    RE_NO_BK_PARENS  2401 libglibc/regex.c           if (syntax & RE_NO_BK_PARENS)
    RE_NO_BK_PARENS  2439 libglibc/regex.c               if (syntax & RE_NO_BK_PARENS)
    RE_NO_BK_PARENS  2488 libglibc/regex.c               if (syntax & RE_NO_BK_PARENS) goto normal_backslash;
    RE_NO_BK_PARENS  3075 libglibc/regex.c        (*prev == '(' && (syntax & RE_NO_BK_PARENS || prev_prev_backslash))
    RE_NO_BK_PARENS  3095 libglibc/regex.c        (syntax & RE_NO_BK_PARENS ? *next == ')'
    RE_NO_BK_PARENS   131 libglibc/regex.h #define RE_NO_BK_REFS (RE_NO_BK_PARENS << 1)
    RE_NO_BK_PARENS   177 libglibc/regex.h    | RE_NO_BK_PARENS              | RE_NO_BK_REFS			\
    RE_NO_BK_PARENS   198 libglibc/regex.h    | RE_NEWLINE_ALT       | RE_NO_BK_PARENS				\
    RE_NO_BK_PARENS   226 libglibc/regex.h    | RE_NO_BK_PARENS        | RE_NO_BK_VBAR				\
    RE_NO_BK_PARENS   234 libglibc/regex.h    | RE_NO_BK_PARENS        | RE_NO_BK_REFS				\