reg.c

#include <regex.h>        
#include<stdio.h>
int main(int arg, char * argv[])
{
regex_t regex;
int reti;
char msgbuf[100];

reti = regcomp(&regex, "^[01]*1[01][01]$", 0);
if (reti) {
    fprintf(stderr, "Could not compile regex\n");
}

reti = regexec(&regex,argv[1], 0, NULL, 0);
if (!reti) {
    puts("Match");
}
else if (reti == REG_NOMATCH) {
    puts("No match");
}
else {
    regerror(reti, &regex, msgbuf, sizeof(msgbuf));
    fprintf(stderr, "Regex match failed: %s\n", msgbuf);
    return 1;
}
}