linux sscanf 解析复杂日志的策略

? Linux ?,sscanf ?????????????????

1. ??,?????????????????????????????,?????????????:

[2021-09-01 12:34:56] INFO: User 'JohnDoe' logged in from IP 192.168.1.100

2. ?? sscanf ?????????????,?????? sscanf ????????????????:

#include
#include

int main() {
    char log[] = "[2021-09-01 12:34:56] INFO: User 'JohnDoe' logged in from IP 192.168.1.100";
    char date[11], time[9], level[6], user[20], ip[20];

    int result = sscanf(log, "[s %8s] %5s: User '[^']' logged in from IP s",
                        date, time, level, user, ip);

    if (result == 5) {
        printf("Date: %s\n", date);
        printf("Time: %s\n", time);
        printf("Level: %s\n", level);
        printf("User: %s\n", user);
        printf("IP: %s\n", ip);
    } else {
        printf("Error parsing the log.\n");
    }

    return 0;
}

?????? sscanf ???????????:

• [s %8s]:???????,????? date ? time ????
• %5s:??????(? INFO?WARNING ?),??? level ????
• User '[^']':?????,??? user ??????,??????????,[^'] ????????????????
• logged in from IP s:???????,???? IP ??,??? ip ????

3. ???????sscanf ??????????????????,??????????????,????????????????

???,???????????????????????????,??????????? sscanf ???????????????,????????????????,????????????????