export function getQuery(name: string, url: string = window.location.search.substr(1)): string | null {
  let regex: RegExp = new RegExp('(^|&)' + name + '=([^&]*)(&|$)'),
    result: RegExpMatchArray | null = url.match(regex)
  if (result !== null) return unescape(result[2])
  return null
}