rb_reg_prepare_re  406 ext/strscan/strscan.c     regex_t *rb_reg_prepare_re(VALUE re, VALUE str);
rb_reg_prepare_re  419 ext/strscan/strscan.c     re = rb_reg_prepare_re(regex, p->str);
rb_reg_prepare_re 1298 re.c               reg = rb_reg_prepare_re(re, str);