如何使用substring截取字符串

在许多编程语言中，substring 方法或函数用于从一个给定的字符串中提取一部分字符

1. Python:

string = "Hello, World!" start_index = 0 end_index = 5 sub_string = string[start_index:end_index] print(sub_string)  # 输出 "Hello" 

2. JavaScript:

let string = "Hello, World!"; let startIndex = 0; let endIndex = 5; let subString = string.substring(startIndex, endIndex); console.log(subString);  // 输出 "Hello" 

3. Java:

public class Main {     public static void main(String[] args) {         String string = "Hello, World!";         int startIndex = 0;         int endIndex = 5;         String subString = string.substring(startIndex, endIndex);         System.out.println(subString);  // 输出 "Hello"     } } 

4. C#:

using System;  class Program {     static void Main() {         string str = "Hello, World!";         int startIndex = 0;         int length = 5;         string subStr = str.Substring(startIndex, length);         Console.WriteLine(subStr);  // 输出 "Hello"     } } 

注意：不同编程语言中 substring 方法的参数和行为可能略有不同。请根据所使用的编程语言查阅相应文档。