OptExactInfo     3970 ext/mbstring/oniguruma/regcomp.c   OptExactInfo exb;    /* boundary */
OptExactInfo     3971 ext/mbstring/oniguruma/regcomp.c   OptExactInfo exm;    /* middle */
OptExactInfo     3972 ext/mbstring/oniguruma/regcomp.c   OptExactInfo expr;   /* prec read (?=...) */