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从字符串中获取指定字符串之间字符串

/*从字符串"This is a test string"中获取"a "到" string"之间的字符串*/#include 
   
    #include 
    
     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

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