OptExactInfo     3759 mbstring/oniguruma/regcomp.c   OptExactInfo exb;    /* boundary */
OptExactInfo     3760 mbstring/oniguruma/regcomp.c   OptExactInfo exm;    /* middle */
OptExactInfo     3761 mbstring/oniguruma/regcomp.c   OptExactInfo expr;   /* prec read (?=...) */