#include <lib9.h>#include <regexp.h>  main(int ac, char **av){	Resub rs[10];	Reprog *p;	char *s;	int i; 	p = regcomp("[^a-z]");	s = "\n";	if(regexec(p, s, rs, 10))		print("%s %lux %lux %lux\n", s, s, rs[0].sp, rs[0].ep);	s = "0";	if(regexec(p, s, rs, 10))		print("%s %lux %lux %lux\n", s, s, rs[0].sp, rs[0].ep);	exits(0);}