const extractHashtags = (text) => {
    // Regex to find words starting with #, followed by alphanumeric characters and underscores
    const hashtagRegex = /#([a-zA-Z0-9_]+)/g;
    const matches = text.match(hashtagRegex);
    if (!matches) {
        return [];
    }
    // Remove the '#' prefix from each tag
    return matches.map(tag => tag.substring(1));
};

console.log(extractHashtags("This is a #test with #multiple #hashtags_123 and #anotherOne."));
// Expected: ["test", "multiple", "hashtags_123", "anotherOne"]

console.log(extractHashtags("No hashtags here."));
// Expected: []

console.log(extractHashtags("#javascript #webdev #programming"));
// Expected: ["javascript", "webdev", "programming"]