function escapeRegExp(str) {
  var escaped = str.replace(/([.+?^=!:${}()|[]/\])/g, "\$1");
  console.log("escaped " + escaped);
  return escaped;
}
function matchUrl() {
  var currentUrl = window.location.toString();
  var loginUrl = "https://*.testsite123.io/testsite123/portal/#/login";
  return currentUrl.match(new RegExp(escapeRegExp(loginUrl), 'g'));
}

console.log("window.location " + window.location.toString());
console.log("match " + matchUrl());

window.location https://prod.testsite123.io/testsite123/portal/#/login
escaped https://*.testsite123.io/testsite123/portal/#/login
match null