AlexGR07

const select = document.querySelector('select');
const reg = /^\d\d\. /;

Array.prototype.forEach.call(
  select,
  n => n.hidden = !reg.test(n.innerText)
);

// или

for (const n of select) {
  n.style.display = n.textContent.search(reg) ? 'none' : '';
}