Address code review comments

Addressed code review comments

app/assets/javascripts/lib/utils/url_utility.js

@@ -445,7 +445,6 @@ export function stripPathTail(path = '') {
   return path.replace(/[^/]+$/, '');
 }
 
-
 export function getURLOrigin(url) {
   if (!url) {
     return window.location.origin;

app/assets/javascripts/static_site_editor/services/templater.js

@@ -15,7 +15,7 @@ const markPrefix = `${marker}-${Date.now()}`;
 
 const reHelpers = {
   template: `.| |\\t|\\n(?!(\\n|${markPrefix}))`,
-  openTag: '<[^iframe]+.*?>',
+  openTag: '<(?!iframe)[a-zA-Z]+.*?>',
   closeTag: '</.+>',
 };
 const reTemplated = new RegExp(`(^${wrapPrefix}(${reHelpers.template})+?${wrapPostfix}$)`, 'gm');

spec/frontend/lib/utils/url_utility_spec.js

@@ -815,7 +815,6 @@ describe('URL utility', () => {
     });
   });
 
-
   describe('getURLOrigin', () => {
     it('when no url passed, returns correct origin from window location', () => {
       const origin = 'https://foo.bar';