l1.c

#include <stdio.h>
#include <sys/types.h>
#include <regex.h>

int main(int argc, char *argv[]){
    int n1,n2,rc;
    FILE *fp;
    char buff[1000];
    regex_t preg;
    regmatch_t mat;


    n1=0;
    n2=0;

    regcomp(&preg, "^.{11}\\s\\d\\d:\\d\\d:\\d\\d\\s\\S+\\s\\w+\\.\\w+\\s\\w+:\\s+ACCEPT|REJECT|DROP\\s+.*$", REG_EXTENDED);

    fp=fopen("kern.log","r");

    while(fgets(buff,sizeof(buff),fp) != NULL){
        rc=regexec(&preg, buff, 1, &mat, 0);
        if(rc>0){
                n1++;
        } else {
                n2++;
        }
    }
    printf("count: %u %u\n",n1,n2);

    fclose(fp);
}