import java.util.Scanner;
/**
* 请从字符串中提取以最后一个[img]开头、以最后一个[\img]结尾的字符串,
* 未找到匹配的字符串返回"null"
* 输入描述:
* 可能包含[img][\img]的字符串
* 输出描述:
* 截取后的字符串
* 输入例子1:
* bbb[img]ccc[img]ddd[\img]eee[\img]
* 输出例子1:
* [img]ddd[\img]eee[\img]
*/
public class Main {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
String str = sc.nextLine();
System.out.println(findImageStr(str));
}
public static String findImageStr(String str) {
if (str == null) {
return "null";
}
int start = str.lastIndexOf("[img]");
int end = str.lastIndexOf("[\\img]");
if (start > -1 && end > -1 && start < end) {
return str.substring(start, end+6);
} else {
return "null";
}
}
}
a = input() startTag, endTag = "[img]","[\img]" result = "null" reverse_a = a[::-1] for i in range(len(a)-6): if reverse_a[i:i+6] == endTag[::-1]: for j in range(i+6,len(a)-5): if reverse_a[j:j+5] == startTag[::-1]: result = reverse_a[i:j+5][::-1] break break print(result)
import java.util.*; public class Main { public static void main(String[] args) { Scanner in = new Scanner(System.in); String s = in.nextLine(); int i = s.lastIndexOf("[img]"); int j = s.lastIndexOf("[\\img]"); if (i == -1 || j == -1 || i > j) { System.out.println("null"); } else { String res = s.substring(i, j + 6); System.out.println(res); } } }