如何检查字符向量是否包含字符串

string = "Hello, world!"
substring = "world"

if substring in string:
    print("Substring found!")
else:
    print("Substring not found.")

#include <iostream>
#include <string>

int main() {
    std::string str = "Hello, world!";
    std::string substr = "world";

    if (str.find(substr) != std::string::npos) {
        std::cout << "Substring found!" << std::endl;
    } else {
        std::cout << "Substring not found." << std::endl;
    }

    return 0;
}

const str = "Hello, world!";
const regex = /world/;

if (regex.test(str)) {
    console.log("Substring found!");
} else {
    console.log("Substring not found.");
}