All Copilot - Download images from a list of <a> links

downloadLinks.js

// Parse <a> tag into the link and the text
function parseLink(str) {
  var m = str.match(/<a\s+href="([^"]+)"[^>]*>([^<]+)<\/a>/i);
  if (m) {
    return {
      href: m[1],
      text: m[2]
    };
  }
  return null;
}

// Node.js read a text file one line at a time
// and pass the line to the callback function
function readFile(file, callback) {
  var lineReader = require('readline').createInterface({
    input: require('fs').createReadStream(file)
  });
  lineReader.on('line', function (line) {
    callback(line);
  });
}

// Node.js download an image from the web from the url and set the filename to the passed in title
function downloadImage(url, title, callback) {
  var request = require('request');
  var fs = require('fs');
  // Remove URL params from URL
  url = url.split('?')[0]
  // Get the file extensions from the URL
  var ext = url.substring(url.lastIndexOf('.') + 1);
  var filename = `${title}.${ext}`;
  // Remove characters from filename that are not allowed on Mac OS X
  filename = filename.replace(/[^a-zA-Z0-9_\-\.]/g, '_');

  request(url).pipe(fs.createWriteStream(`output/${filename}`)).on('close', function () {
    callback();
  });
}

readFile(process.argv[2], function (line) {
  var link = parseLink(line);
  if (link) {
    downloadImage(link.href, link.text, () => {
      console.log(link.text);
    })
  }
})

GitHub Copilot is amazing. This code is almost entirely written by CoPilot. I pretty much only wrote the comments. All code pulled in from CoPilot worked without bugs.
Example usage: node.js downloadLinks.js ./input.txt

input.txt

<a href="https://via.placeholder.com/350x150">Placeholder Image</a>
<a href="https://via.placeholder.com/350x350">Placeholder Image 2</a>