function extractImageUrls(htmlString) {
  const imageUrls = [];
  // Regex to find <img> tags and capture the src attribute content
  // Note: For robust HTML parsing, a DOM parser is generally recommended.
  // This is for simple cases or learning regex application.
  const imgRegex = /<img[^>]+src="([^"]+)"/g;
  let match;

  while ((match = imgRegex.exec(htmlString)) !== null) {
    if (match[1]) {
      imageUrls.push(match[1]);
    }
  }
  return imageUrls;
}

// Example:
// const html = '<img src="image1.jpg" alt="Description 1"><p>Some text</p><img src="/assets/image2.png">';
// console.log(extractImageUrls(html)); // ["image1.jpg", "/assets/image2.png"]