Returns only numbers without leading 0s

onlyNumbers.ts

const getOnlyNumbers = (value: string, maxLength?: number) => {
  // ignores everything except numbers
  // also ignores leading 0s
  const filter = value.replace(/[^0-9]+|^0+/, '');
  if (maxLength) {
    return filter.substring(0, maxLength);
  }
  return filter;
};