從字串中獲取指定字串之間字串

/*從字串"This is a test string"中獲取"a "到" string"之間的字串*/
#include <stdio.h>
#include <string.h>
char *get_timestr_from_json(char *src)
{
    printf("The get_timestr_from_json start!\r\n");
    char *target = NULL;
    char dest[100] = {0};
    char
 
 *p1, *p2;
    p1 = strstr(src, "a ");
    p2 = strstr(src, " string");
    while (p1 != NULL && p2 != NULL && p1 > p2)
    {
        p2++;
        p2 = strstr(p2, " string");
    }
    if (p1 == NULL || p2 == NULL || p1 > p2)
    {
        printf(
 
"Not found\n");
    }
    else
    {
        p1 += strlen("a ");
        memcpy(dest, p1, p2 - p1);
        target = dest;
    }
    printf("The get_timestr_from_json over!\r\n");
    return target;
}

int main()
{
    char *src = "This is a test string";
    char
 
 *time_str = NULL;
    time_str = get_timestr_from_json(src);
    if (time_str)
    {
        printf("%s\n",time_str);
    }
    return 0;
}

演示