Regex: syntax error in subpattern name (missing terminator)

[edrivera3]

Hi
I encountered the following error message :

Error Message:
Error in 'rex' command: Encountered the following error while compiling the regex '(?<failed_step>STEP:[&#92w&#92W\n]+?RETRIES:\s{3}\d+)': Regex: syntax error in subpattern name (missing terminator)

The extraction works correctly in the Search and Reporting App.

This my html page:
<script>
var deps = [
"splunkjs/ready!",
"splunkjs/mvc",
"splunkjs/mvc/utils",
"splunkjs/mvc/searchmanager",
"splunkjs/mvc/chartview",
"splunkjs/mvc/checkboxgroupview",
"splunkjs/mvc/checkboxview",
"splunkjs/mvc/dropdownview",
"splunkjs/mvc/eventsviewerview",
"splunkjs/mvc/multidropdownview",
"splunkjs/mvc/radiogroupview",
"splunkjs/mvc/searchbarview",
"splunkjs/mvc/searchcontrolsview",
"splunkjs/mvc/singleview",
"splunkjs/mvc/tableview",
"splunkjs/mvc/textinputview",
"splunkjs/mvc/timelineview",
"splunkjs/mvc/timerangeview",
"splunkjs/mvc/simplexml",
"splunkjs/mvc/splunkmapview",
"jquery",
"splunk_wftoolkit/components/bubblechart/bubblechart",
"splunk.config",
"underscore"
];
require(deps, function(mvc) {
// Load individual components
var SearchManager = require("splunkjs/mvc/searchmanager");
var TimelineView = require("splunkjs/mvc/timelineview");
var ChartView = require("splunkjs/mvc/chartview");
var CheckboxGroupView = require("splunkjs/mvc/checkboxgroupview");
var CheckboxView = require("splunkjs/mvc/checkboxview");
var DropdownView = require("splunkjs/mvc/dropdownview");
var EventsViewer = require("splunkjs/mvc/eventsviewerview");
var MultiDropdownView = require("splunkjs/mvc/multidropdownview");
var RadioGroupView = require("splunkjs/mvc/radiogroupview");
var SearchbarView = require("splunkjs/mvc/searchbarview");
var SearchControlsView = require("splunkjs/mvc/searchcontrolsview");
var SingleView = require("splunkjs/mvc/singleview");
var TableView = require("splunkjs/mvc/tableview");
var TextInputView = require("splunkjs/mvc/textinputview");
var TimeRangeView = require("splunkjs/mvc/timerangeview");
var BubbleView = require("splunk_wftoolkit/components/bubblechart/bubblechart");

// Table (Top Failed Steps in test containing this error)

var Top_FailStep = new SearchManager({
    id: "Top_FailStep",
    search: mvc.tokenSafe('index=tirfile AND [search index=jobevent earliest=\"-1y\" latest=\"now\" error_num=$error_num$ test_num=$test_num$ | fields test_num,cart_num] | rex field=test_step \"(?<failed_step>STEP:[\\w\\W\\n]+?RETRIES:\\s{3}\\d+)\" '),
        cache: true,
        preview: true
});

var table_Top_FailStep = new TableView({
    id: "table_Top_FailStep",
    managerid: "Top_FailStep",
    el: $("#table_Top_FailStep")
}).render();

I appreciate your help.