如何检查关键字是否存在而不区分大小写？

def keyword_exists(text, keyword):
    return keyword.lower() in text.lower()

text = "Hello World"
keyword = "world"
print(keyword_exists(text, keyword))  # 输出: True

function keywordExists(text, keyword) {
    return text.toLowerCase().includes(keyword.toLowerCase());
}

const text = "Hello World";
const keyword = "world";
console.log(keywordExists(text, keyword));  // 输出: true

public class KeywordChecker {
    public static boolean keywordExists(String text, String keyword) {
        return text.toLowerCase().contains(keyword.toLowerCase());
    }

    public static void main(String[] args) {
        String text = "Hello World";
        String keyword = "world";
        System.out.println(keywordExists(text, keyword));  // 输出: true
    }
}

using System;

public class KeywordChecker
{
    public static bool KeywordExists(string text, string keyword)
    {
        return text.ToLowerInvariant().Contains(keyword.ToLowerInvariant());
    }

    public static void Main()
    {
        string text = "Hello World";
        string keyword = "world";
        Console.WriteLine(KeywordExists(text, keyword));  // 输出: True
    }
}

SELECT * FROM table_name WHERE LOWER(column_name) LIKE LOWER('%keyword%');