querySelectorAll with regex support

queryselector.js

/**
 * querySelectorAll with regex support.
 * TS version: https://gist.github.com/sagirk/3240407ebbc9369356759a806b66fe34.
 *
 * Note: In the `attributeToSearch` parameter's absence, all attributes on all
 * DOM nodes will be searched. This can get quite expensive for large DOM trees.
 *
 * Usage example:
 * `querySelectorAllRegex(/someregex/, 'target-specific-attribute-if-needed');`
 *
 * @param {RegExp} regex - A regular expression selector.
 * @param {string} attributeToSearch - A specific attribute to search on.
 * @returns {Element[]} All element descendants of nodes that match the regex
 * selector.
 */
function querySelectorAllRegex(regex, attributeToSearch) {
  const output = [];
  if (attributeToSearch) {
    for (let element of document.querySelectorAll(`[${attributeToSearch}]`)) {
      if (regex.test(element.getAttribute(attributeToSearch))) {
        output.push(element);
      }
    }
  } else {
    for (let element of document.querySelectorAll('*')) {
      for (let attribute of element.attributes) {
        if (regex.test(attribute.value)) {
          output.push(element);
        }
      }
    }
  }
  return output;
}