从给定字符串中提取子字符串

def extract_substring(string, start, end):
    return string[start:end]

string = "这是一个示例字符串"
start = 2
end = 5

substring = extract_substring(string, start, end)
print(substring)

function extractSubstring(string, start, end) {
    return string.substring(start, end);
}

var string = "这是一个示例字符串";
var start = 2;
var end = 5;

var substring = extractSubstring(string, start, end);
console.log(substring);