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#include <stdlib.h>
#include <regex.h>
#include <stdio.h>
void eprint(char *msg){
fprintf(stderr, "%s\n", msg);
exit(1);
}
int main(){
regex_t expr;
if (regcomp(&expr, "(1|0)+", 0) != 0) eprint("regcomp failed!");
int ret = regexec(&expr, "1010", 0, NULL, 0);
printf("%d\n", ret);
}
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