revert to regex to address issue discovered by CodeQL

js/test/Helper.js

@@ -82,7 +82,8 @@ describe('Helper', function () {
             'ignores non-URL content',
             'string',
             function (content) {
-                content = content.replace(/\r|\f/g, '\n').replace('\u0000', '').replace('\u000b', '');
+                // eslint-disable-next-line no-control-regex
+                content = content.replace(/\r|\f/g, '\n').replace(/\u0000/g, '').replace(/\u000b/g, '');
                 let clean = jsdom();
                 $('body').html('<div id="foo"></div>');
                 let e = $('#foo');
@@ -100,8 +101,10 @@ describe('Helper', function () {
             jsc.array(common.jscHashString()),
             'string',
             function (prefix, url, fragment, postfix) {
-                prefix = prefix.replace(/\r|\f/g, '\n').replace('\u0000', '').replace('\u000b', '');
-                postfix  = ' ' + postfix.replace('\r', '\n').replace('\u0000', '');
+                // eslint-disable-next-line no-control-regex
+                prefix = prefix.replace(/\r|\f/g, '\n').replace(/\u0000/g, '').replace(/\u000b/g, '');
+                // eslint-disable-next-line no-control-regex
+                postfix  = ' ' + postfix.replace(/\r/g, '\n').replace(/\u0000/g, '');
                 url.fragment = fragment.join('');
                 let urlString = common.urlToString(url),
                     clean = jsdom();
@@ -132,8 +135,10 @@ describe('Helper', function () {
             jsc.array(common.jscQueryString()),
             'string',
             function (prefix, query, postfix) {
-                prefix = prefix.replace(/\r|\f/g, '\n').replace('\u0000', '').replace('\u000b', '');
-                postfix = ' ' + postfix.replace('\r', '\n').replace('\u0000', '');
+                // eslint-disable-next-line no-control-regex
+                prefix = prefix.replace(/\r|\f/g, '\n').replace(/\u0000/g, '').replace(/\u000b/g, '');
+                // eslint-disable-next-line no-control-regex
+                postfix = ' ' + postfix.replace(/\r/g, '\n').replace(/\u0000/g, '');
                 let url  = 'magnet:?' + query.join('').replace(/^&+|&+$/gm, ''),
                     clean = jsdom();
                 $('body').html('<div id="foo"></div>');