#include <regex.h>
#include <stdio.h>

void *alloc_huge(size_t n, int c);

int main()
{
	size_t len = (1ULL<<32) + 65536;
	char *h = alloc_huge(len, 'a');
	h[len-100] = 'b';
	h[len-1] = 0;

	regex_t re;
	regmatch_t rm;
	regcomp(&re, "b", REG_EXTENDED);
	int ret = regexec(&re, h, 1, &rm, 0);
	printf("%d %zd %zd\n", ret, rm.rm_so, rm.rm_eo);
}