^|$ not handled correctly with REG_NOTBOL

[mohd-akram]

The following:

#include <stdio.h>
#include <tre/tre.h>

int main(void)
{
	regex_t preg;
	tre_regcomp(&preg, "^|$", REG_EXTENDED);
	regmatch_t pmatch[1];
	printf("%d\n", tre_regexec(&preg, "", 1, pmatch, REG_NOTBOL));
	return 0;
}

prints 1. It should print 0 (this is the case in FreeBSD libc and Linux libc).